diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/transaction/jta/BitronixJtaConfiguration.java b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/transaction/jta/BitronixJtaConfiguration.java
index 1edf664e77..8ddf9e5cae 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/transaction/jta/BitronixJtaConfiguration.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/transaction/jta/BitronixJtaConfiguration.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -51,7 +51,9 @@ import org.springframework.util.StringUtils;
  * @author Phillip Webb
  * @author Andy Wilkinson
  * @author Kazuki Shimizu
+ * @deprecated since 2.3.0 as the Bitronix project is no longer being maintained
  */
+@Deprecated
 @Configuration(proxyBeanMethods = false)
 @EnableConfigurationProperties(JtaProperties.class)
 @ConditionalOnClass({ JtaTransactionManager.class, BitronixContext.class })
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/transaction/jta/JtaAutoConfiguration.java b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/transaction/jta/JtaAutoConfiguration.java
index 2fb24cec7c..2b8d8cfefb 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/transaction/jta/JtaAutoConfiguration.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/transaction/jta/JtaAutoConfiguration.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,6 +35,7 @@ import org.springframework.context.annotation.Import;
  * @author Nishant Raut
  * @since 1.2.0
  */
+@SuppressWarnings("deprecation")
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnClass(javax.transaction.Transaction.class)
 @ConditionalOnProperty(prefix = "spring.jta", value = "enabled", matchIfMissing = true)
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/transaction/jta/JtaAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/transaction/jta/JtaAutoConfigurationTests.java
index 06573d1407..1170e0b71f 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/transaction/jta/JtaAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/transaction/jta/JtaAutoConfigurationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -71,6 +71,7 @@ import static org.mockito.Mockito.mock;
  * @author Kazuki Shimizu
  * @author Nishant Raut
  */
+@SuppressWarnings("deprecation")
 class JtaAutoConfigurationTests {
 
 	private AnnotationConfigApplicationContext context;
@@ -115,6 +116,7 @@ class JtaAutoConfigurationTests {
 	}
 
 	@Test
+	@Deprecated
 	void bitronixSanityCheck() {
 		this.context = new AnnotationConfigApplicationContext(JtaProperties.class, BitronixJtaConfiguration.class);
 		this.context.getBean(bitronix.tm.Configuration.class);
@@ -126,6 +128,7 @@ class JtaAutoConfigurationTests {
 	}
 
 	@Test
+	@Deprecated
 	void defaultBitronixServerId() throws UnknownHostException {
 		this.context = new AnnotationConfigApplicationContext(BitronixJtaConfiguration.class);
 		String serverId = this.context.getBean(bitronix.tm.Configuration.class).getServerId();
@@ -133,6 +136,7 @@ class JtaAutoConfigurationTests {
 	}
 
 	@Test
+	@Deprecated
 	void customBitronixServerId() {
 		this.context = new AnnotationConfigApplicationContext();
 		TestPropertyValues.of("spring.jta.transactionManagerId:custom").applyTo(this.context);
@@ -167,6 +171,7 @@ class JtaAutoConfigurationTests {
 	}
 
 	@Test
+	@Deprecated
 	void bitronixConnectionFactoryPoolConfiguration() {
 		this.context = new AnnotationConfigApplicationContext();
 		TestPropertyValues.of("spring.jta.bitronix.connectionfactory.minPoolSize:5",
@@ -192,6 +197,7 @@ class JtaAutoConfigurationTests {
 	}
 
 	@Test
+	@Deprecated
 	void bitronixDataSourcePoolConfiguration() {
 		this.context = new AnnotationConfigApplicationContext();
 		TestPropertyValues
@@ -218,6 +224,7 @@ class JtaAutoConfigurationTests {
 	}
 
 	@Test
+	@Deprecated
 	void bitronixCustomizeJtaTransactionManagerUsingProperties() {
 		this.context = new AnnotationConfigApplicationContext();
 		TestPropertyValues
diff --git a/spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc b/spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc
index 24f138f721..169cca114b 100644
--- a/spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc
+++ b/spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc
@@ -5889,7 +5889,8 @@ When a `jndi-name` is set, it takes precedence over all other Session-related se
 
 [[boot-features-jta]]
 == Distributed Transactions with JTA
-Spring Boot supports distributed JTA transactions across multiple XA resources by using either an https://www.atomikos.com/[Atomikos] or https://github.com/bitronix/btm[Bitronix] embedded transaction manager.
+Spring Boot supports distributed JTA transactions across multiple XA resources by using an https://www.atomikos.com/[Atomikos] embedded transaction manager.
+Deprecated support for using a https://github.com/bitronix/btm[Bitronix] embedded transaction manager is also provided but it will be removed in a future release.
 JTA transactions are also supported when deploying to a suitable Java EE Application Server.
 
 When a JTA environment is detected, Spring's `JtaTransactionManager` is used to manage transactions.
@@ -5918,7 +5919,8 @@ To ensure uniqueness in production, you should configure the configprop:spring.j
 
 [[boot-features-jta-bitronix]]
 === Using a Bitronix Transaction Manager
-https://github.com/bitronix/btm[Bitronix] is a popular open-source JTA transaction manager implementation.
+NOTE: As of Spring Boot 2.3, support for Bitronix has been deprecated and will be removed in a future release.
+
 You can use the `spring-boot-starter-jta-bitronix` starter to add the appropriate Bitronix dependencies to your project.
 As with Atomikos, Spring Boot automatically configures Bitronix and post-processes your beans to ensure that startup and shutdown ordering is correct.
 
@@ -5978,7 +5980,7 @@ The {spring-boot-module-code}/jms/XAConnectionFactoryWrapper.java[`XAConnectionF
 The interfaces are responsible for wrapping `XAConnectionFactory` and `XADataSource` beans and exposing them as regular `ConnectionFactory` and `DataSource` beans, which transparently enroll in the distributed transaction.
 DataSource and JMS auto-configuration use JTA variants, provided you have a `JtaTransactionManager` bean and appropriate XA wrapper beans registered within your `ApplicationContext`.
 
-The {spring-boot-module-code}/jta/bitronix/BitronixXAConnectionFactoryWrapper.java[BitronixXAConnectionFactoryWrapper] and {spring-boot-module-code}/jta/bitronix/BitronixXADataSourceWrapper.java[BitronixXADataSourceWrapper] provide good examples of how to write XA wrappers.
+The {spring-boot-module-code}/jta/atomikos/AtomikosXAConnectionFactoryWrapper.java[AtomikosXAConnectionFactoryWrapper] and {spring-boot-module-code}/jta/atomikos/AtomikosXADataSourceWrapper.java[AtomikosXADataSourceWrapper] provide good examples of how to write XA wrappers.
 
 
 
diff --git a/spring-boot-project/spring-boot-starters/spring-boot-starter-jta-bitronix/build.gradle b/spring-boot-project/spring-boot-starters/spring-boot-starter-jta-bitronix/build.gradle
index 019fb12558..ee541b4a07 100644
--- a/spring-boot-project/spring-boot-starters/spring-boot-starter-jta-bitronix/build.gradle
+++ b/spring-boot-project/spring-boot-starters/spring-boot-starter-jta-bitronix/build.gradle
@@ -2,7 +2,7 @@ plugins {
 	id "org.springframework.boot.starter"
 }
 
-description = "Starter for JTA transactions using Bitronix"
+description = "Starter for JTA transactions using Bitronix. Deprecated since 2.3.0"
 
 dependencies {
 	api(platform(project(":spring-boot-project:spring-boot-dependencies")))
diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixDependentBeanFactoryPostProcessor.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixDependentBeanFactoryPostProcessor.java
index 8591985086..3cebd875ac 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixDependentBeanFactoryPostProcessor.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixDependentBeanFactoryPostProcessor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,7 +32,9 @@ import org.springframework.core.Ordered;
  *
  * @author Phillip Webb
  * @since 1.2.0
+ * @deprecated since 2.3.0 as the Bitronix project is no longer being maintained
  */
+@Deprecated
 public class BitronixDependentBeanFactoryPostProcessor implements BeanFactoryPostProcessor, Ordered {
 
 	private static final String[] NO_BEANS = {};
diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixXAConnectionFactoryWrapper.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixXAConnectionFactoryWrapper.java
index 4a3749073a..fc1b0d7eab 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixXAConnectionFactoryWrapper.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixXAConnectionFactoryWrapper.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,7 +27,9 @@ import org.springframework.boot.jms.XAConnectionFactoryWrapper;
  *
  * @author Phillip Webb
  * @since 1.2.0
+ * @deprecated since 2.3.0 as the Bitronix project is no longer being maintained
  */
+@Deprecated
 public class BitronixXAConnectionFactoryWrapper implements XAConnectionFactoryWrapper {
 
 	@Override
diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixXADataSourceWrapper.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixXADataSourceWrapper.java
index c443f97004..c766a82dab 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixXADataSourceWrapper.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/BitronixXADataSourceWrapper.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,7 +26,9 @@ import org.springframework.boot.jdbc.XADataSourceWrapper;
  *
  * @author Phillip Webb
  * @since 1.2.0
+ * @deprecated since 2.3.0 as the Bitronix project is no longer being maintained
  */
+@Deprecated
 public class BitronixXADataSourceWrapper implements XADataSourceWrapper {
 
 	@Override
diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/PoolingConnectionFactoryBean.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/PoolingConnectionFactoryBean.java
index 0de3e82c67..484c4c26be 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/PoolingConnectionFactoryBean.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/PoolingConnectionFactoryBean.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -41,7 +41,9 @@ import org.springframework.util.StringUtils;
  * @author Josh Long
  * @author Andy Wilkinson
  * @since 1.2.0
+ * @deprecated since 2.3.0 as the Bitronix project is no longer being maintained
  */
+@Deprecated
 @SuppressWarnings("serial")
 @ConfigurationProperties(prefix = "spring.jta.bitronix.connectionfactory")
 public class PoolingConnectionFactoryBean extends PoolingConnectionFactory
diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/PoolingDataSourceBean.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/PoolingDataSourceBean.java
index af1b9c9aa3..21a80bb935 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/PoolingDataSourceBean.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/PoolingDataSourceBean.java
@@ -42,7 +42,9 @@ import org.springframework.util.StringUtils;
  * @author Josh Long
  * @author Andy Wilkinson
  * @since 1.2.0
+ * @deprecated since 2.3.0 as the Bitronix project is no longer being maintained
  */
+@Deprecated
 @SuppressWarnings("serial")
 @ConfigurationProperties(prefix = "spring.jta.bitronix.datasource")
 public class PoolingDataSourceBean extends PoolingDataSource implements BeanNameAware, InitializingBean {
diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/package-info.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/package-info.java
index e91d18370a..71a5709d26 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/package-info.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/bitronix/package-info.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,5 +16,6 @@
 
 /**
  * Support classes for Bitronix JTA.
+ * @deprecated since 2.3.0 as the Bitronix project is no longer being maintained
  */
 package org.springframework.boot.jta.bitronix;
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixDependentBeanFactoryPostProcessorTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixDependentBeanFactoryPostProcessorTests.java
index 0154e8153c..ab8f474f95 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixDependentBeanFactoryPostProcessorTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixDependentBeanFactoryPostProcessorTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -36,6 +36,7 @@ import static org.mockito.Mockito.verify;
  *
  * @author Phillip Webb
  */
+@Deprecated
 class BitronixDependentBeanFactoryPostProcessorTests {
 
 	private AnnotationConfigApplicationContext context;
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixXAConnectionFactoryWrapperTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixXAConnectionFactoryWrapperTests.java
index 21da1d5267..6369668111 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixXAConnectionFactoryWrapperTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixXAConnectionFactoryWrapperTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -29,6 +29,7 @@ import static org.mockito.Mockito.mock;
  *
  * @author Phillip Webb
  */
+@Deprecated
 class BitronixXAConnectionFactoryWrapperTests {
 
 	@Test
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixXADataSourceWrapperTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixXADataSourceWrapperTests.java
index b7eb2e6011..f47bf4c45c 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixXADataSourceWrapperTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/BitronixXADataSourceWrapperTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -29,6 +29,7 @@ import static org.mockito.Mockito.mock;
  *
  * @author Phillip Webb
  */
+@Deprecated
 class BitronixXADataSourceWrapperTests {
 
 	@Test
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/PoolingConnectionFactoryBeanTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/PoolingConnectionFactoryBeanTests.java
index cd3a9f1911..9655b5fb0e 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/PoolingConnectionFactoryBeanTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/PoolingConnectionFactoryBeanTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -29,6 +29,7 @@ import static org.mockito.Mockito.verify;
  *
  * @author Phillip Webb
  */
+@Deprecated
 class PoolingConnectionFactoryBeanTests {
 
 	@SuppressWarnings("serial")
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/PoolingDataSourceBeanTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/PoolingDataSourceBeanTests.java
index 057da9d6da..a45ad23070 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/PoolingDataSourceBeanTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jta/bitronix/PoolingDataSourceBeanTests.java
@@ -36,6 +36,7 @@ import static org.mockito.Mockito.verify;
  *
  * @author Phillip Webb
  */
+@Deprecated
 class PoolingDataSourceBeanTests {
 
 	private PoolingDataSourceBean bean = new PoolingDataSourceBean();