diff --git a/spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/mock/mockito/MockitoPostProcessor.java b/spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/mock/mockito/MockitoPostProcessor.java
index 587dc98fe3c..b7cc40a47bc 100644
--- a/spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/mock/mockito/MockitoPostProcessor.java
+++ b/spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/mock/mockito/MockitoPostProcessor.java
@@ -27,6 +27,7 @@ import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;
 
+import org.springframework.aop.scope.ScopedObject;
 import org.springframework.aop.scope.ScopedProxyUtils;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.PropertyValues;
@@ -357,6 +358,9 @@ public class MockitoPostProcessor extends InstantiationAwareBeanPostProcessorAda
 			Assert.state(ReflectionUtils.getField(field, target) == null,
 					() -> "The field " + field + " cannot have an existing value");
 			Object bean = this.beanFactory.getBean(beanName, field.getType());
+			if (bean instanceof ScopedObject) {
+				bean = ((ScopedObject) bean).getTargetObject();
+			}
 			ReflectionUtils.setField(field, target, bean);
 		}
 		catch (Throwable ex) {
@@ -442,15 +446,22 @@ public class MockitoPostProcessor extends InstantiationAwareBeanPostProcessorAda
 
 		@Override
 		public Object getEarlyBeanReference(Object bean, String beanName) throws BeansException {
-			return this.mockitoPostProcessor.createSpyIfNecessary(bean, beanName);
+			return this.mockitoPostProcessor.createSpyIfNecessary(bean, getOriginalBeanNameIfScopedTarget(beanName));
 		}
 
 		@Override
 		public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
-			if (bean instanceof FactoryBean) {
+			if (bean instanceof FactoryBean || bean instanceof ScopedObject) {
 				return bean;
 			}
-			return this.mockitoPostProcessor.createSpyIfNecessary(bean, beanName);
+			return this.mockitoPostProcessor.createSpyIfNecessary(bean, getOriginalBeanNameIfScopedTarget(beanName));
+		}
+
+		private String getOriginalBeanNameIfScopedTarget(String beanName) {
+			if (ScopedProxyUtils.isScopedTarget(beanName)) {
+				return beanName.substring("scopedTarget.".length());
+			}
+			return beanName;
 		}
 
 		static void register(BeanDefinitionRegistry registry) {
diff --git a/spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/mock/mockito/SpyBeanOnTestFieldForExistingScopedBeanIntegrationTests.java b/spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/mock/mockito/SpyBeanOnTestFieldForExistingScopedBeanIntegrationTests.java
new file mode 100644
index 00000000000..eb413f3ef62
--- /dev/null
+++ b/spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/mock/mockito/SpyBeanOnTestFieldForExistingScopedBeanIntegrationTests.java
@@ -0,0 +1,113 @@
+/*
+ * Copyright 2012-2019 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.test.mock.mockito;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+import org.springframework.beans.factory.ObjectFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.config.CustomScopeConfigurer;
+import org.springframework.boot.test.mock.mockito.SpyBeanOnTestFieldForExistingScopedBeanIntegrationTests.SpyBeanOnTestFieldForExistingScopedBeanConfig;
+import org.springframework.boot.test.mock.mockito.example.ExampleService;
+import org.springframework.boot.test.mock.mockito.example.ExampleServiceCaller;
+import org.springframework.boot.test.mock.mockito.example.SimpleExampleService;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+import org.springframework.context.annotation.Scope;
+import org.springframework.context.annotation.ScopedProxyMode;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.verify;
+
+/**
+ * Test {@link SpyBean @SpyBean} on a test class field can be used to replace existing
+ * scoped beans.
+ *
+ * @author Andy Wilkinson
+ */
+@ExtendWith(SpringExtension.class)
+@ContextConfiguration(classes = SpyBeanOnTestFieldForExistingScopedBeanConfig.class)
+public class SpyBeanOnTestFieldForExistingScopedBeanIntegrationTests {
+
+	@SpyBean
+	private ExampleService exampleService;
+
+	@Autowired
+	private ExampleServiceCaller caller;
+
+	@Test
+	void testSpying() {
+		assertThat(this.caller.sayGreeting()).isEqualTo("I say simple");
+		verify(this.exampleService).greeting();
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@Import({ ExampleServiceCaller.class })
+	static class SpyBeanOnTestFieldForExistingScopedBeanConfig {
+
+		@Bean
+		@Scope(scopeName = "custom", proxyMode = ScopedProxyMode.TARGET_CLASS)
+		SimpleExampleService simpleExampleService() {
+			return new SimpleExampleService();
+		}
+
+		@Bean
+		static CustomScopeConfigurer customScopeConfigurer() {
+			CustomScopeConfigurer configurer = new CustomScopeConfigurer();
+			configurer.addScope("custom", new org.springframework.beans.factory.config.Scope() {
+
+				private Object bean;
+
+				@Override
+				public Object resolveContextualObject(String key) {
+					throw new UnsupportedOperationException();
+				}
+
+				@Override
+				public Object remove(String name) {
+					throw new UnsupportedOperationException();
+				}
+
+				@Override
+				public void registerDestructionCallback(String name, Runnable callback) {
+					throw new UnsupportedOperationException();
+				}
+
+				@Override
+				public String getConversationId() {
+					throw new UnsupportedOperationException();
+				}
+
+				@Override
+				public Object get(String name, ObjectFactory<?> objectFactory) {
+					if (this.bean == null) {
+						this.bean = objectFactory.getObject();
+					}
+					return this.bean;
+				}
+
+			});
+			return configurer;
+		}
+
+	}
+
+}