diff --git a/packages/aws-cdk-lib/aws-codepipeline/lib/pipeline.ts b/packages/aws-cdk-lib/aws-codepipeline/lib/pipeline.ts
index ab75f29c2e4c1..b8a0e732b18e3 100644
--- a/packages/aws-cdk-lib/aws-codepipeline/lib/pipeline.ts
+++ b/packages/aws-cdk-lib/aws-codepipeline/lib/pipeline.ts
@@ -494,8 +494,6 @@ export class Pipeline extends PipelineBase {
       Annotations.of(this).addWarningV2('@aws-cdk/aws-codepipeline:unspecifiedPipelineType', 'V1 pipeline type is implicitly selected when `pipelineType` is not set. If you want to use V2 type, set `PipelineType.V2`.');
     }
     this.pipelineType = props.pipelineType ?? PipelineType.V1;
-    this.variables = props.variables ?? [];
-    this.triggers = props.triggers?.map(trigger => this.addTrigger(trigger)) ?? [];
 
     this.codePipeline = new CfnPipeline(this, 'Resource', {
       artifactStore: Lazy.any({ produce: () => this.renderArtifactStoreProperty() }),
@@ -534,6 +532,12 @@ export class Pipeline extends PipelineBase {
     for (const stage of props.stages || []) {
       this.addStage(stage);
     }
+    for (const variable of props.variables || []) {
+      this.addVariable(variable);
+    }
+    for (const trigger of props.triggers || []) {
+      this.addTrigger(trigger);
+    }
 
     this.node.addValidation({ validate: () => this.validatePipeline() });
   }
@@ -572,9 +576,16 @@ export class Pipeline extends PipelineBase {
    * Adds a new Variable to this Pipeline.
    *
    * @param variable Variable instance to add to this Pipeline
+   * @returns the newly created variable
    */
-  public addVariable(variable: Variable) {
+  public addVariable(variable: Variable): Variable {
+    // check for duplicate variables and names
+    if (this.variables.find(v => v.variableName === variable.variableName)) {
+      throw new Error(`Variable with duplicate name '${variable.variableName}' added to the Pipeline`);
+    }
+
     this.variables.push(variable);
+    return variable;
   }
 
   /**
@@ -585,6 +596,13 @@ export class Pipeline extends PipelineBase {
    */
   public addTrigger(props: TriggerProps): Trigger {
     const trigger = new Trigger(props);
+    const actionName = props.gitConfiguration?.sourceAction.actionProperties.actionName;
+
+    // check for duplicate source actions for triggers
+    if (actionName !== undefined && this.triggers.find(t => t.sourceAction?.actionProperties.actionName === actionName)) {
+      throw new Error(`Trigger with duplicate source action '${actionName}' added to the Pipeline`);
+    }
+
     this.triggers.push(trigger);
     return trigger;
   }
diff --git a/packages/aws-cdk-lib/aws-codepipeline/lib/trigger.ts b/packages/aws-cdk-lib/aws-codepipeline/lib/trigger.ts
index 0809d29f18b3a..9a83e6408f0bb 100644
--- a/packages/aws-cdk-lib/aws-codepipeline/lib/trigger.ts
+++ b/packages/aws-cdk-lib/aws-codepipeline/lib/trigger.ts
@@ -93,7 +93,13 @@ export interface TriggerProps {
  * Trigger.
  */
 export class Trigger {
+  /**
+   * The pipeline source action where the trigger configuration.
+   */
+  public readonly sourceAction: IAction | undefined;
+
   constructor(private readonly props: TriggerProps) {
+    this.sourceAction = props.gitConfiguration?.sourceAction;
     this.validate();
   }
 
@@ -147,7 +153,7 @@ export class Trigger {
     }
 
     return {
-      gitConfiguration: gitConfiguration,
+      gitConfiguration,
       providerType: this.props.providerType,
     };
   }
diff --git a/packages/aws-cdk-lib/aws-codepipeline/lib/variable.ts b/packages/aws-cdk-lib/aws-codepipeline/lib/variable.ts
index 46b139ba1f34b..bddd2598d2100 100644
--- a/packages/aws-cdk-lib/aws-codepipeline/lib/variable.ts
+++ b/packages/aws-cdk-lib/aws-codepipeline/lib/variable.ts
@@ -31,7 +31,11 @@ export interface VariableProps {
  * Pipeline-Level variable.
  */
 export class Variable {
-  private readonly variableName: string;
+  /**
+   * The name of a pipeline-level variable.
+   */
+  public readonly variableName: string;
+
   private readonly description?: string;
   private readonly defaultValue?: string;
 
diff --git a/packages/aws-cdk-lib/aws-codepipeline/test/triggers.test.ts b/packages/aws-cdk-lib/aws-codepipeline/test/triggers.test.ts
index 670a31003664e..1970bd42f556c 100644
--- a/packages/aws-cdk-lib/aws-codepipeline/test/triggers.test.ts
+++ b/packages/aws-cdk-lib/aws-codepipeline/test/triggers.test.ts
@@ -337,6 +337,30 @@ describe('triggers', () => {
     }).toThrow(/provider for actionProperties in sourceAction with name 'FakeSource' must be 'CodeStarSourceConnection', got 'Fake'/);
   });
 
+  test('throw if source action with duplicate action name added to the Pipeline', () => {
+    const pipeline = new codepipeline.Pipeline(stack, 'Pipeline', {
+      pipelineType: codepipeline.PipelineType.V2,
+      triggers: [{
+        providerType: codepipeline.ProviderType.CODE_STAR_SOURCE_CONNECTION,
+        gitConfiguration: {
+          sourceAction,
+          pushFilter: [{
+            excludedTags: ['exclude1', 'exclude2'],
+            includedTags: ['include1', 'include2'],
+          }],
+        },
+      }],
+    });
+    expect(() => {
+      pipeline.addTrigger({
+        providerType: codepipeline.ProviderType.CODE_STAR_SOURCE_CONNECTION,
+        gitConfiguration: {
+          sourceAction,
+        },
+      });
+    }).toThrow(/Trigger with duplicate source action 'CodeStarConnectionsSourceAction' added to the Pipeline/);
+  });
+
   test('throw if triggers are specified when pipelineType is not set to V2', () => {
     const pipeline = new codepipeline.Pipeline(stack, 'Pipeline', {
       pipelineType: codepipeline.PipelineType.V1,
diff --git a/packages/aws-cdk-lib/aws-codepipeline/test/variables.test.ts b/packages/aws-cdk-lib/aws-codepipeline/test/variables.test.ts
index 72b2127ccba04..912d89551a44b 100644
--- a/packages/aws-cdk-lib/aws-codepipeline/test/variables.test.ts
+++ b/packages/aws-cdk-lib/aws-codepipeline/test/variables.test.ts
@@ -338,6 +338,20 @@ describe('variables', () => {
         });
       }).toThrow(/Description for variable 'var-name-1' must not be greater than 200 characters long, got 201/);
     });
+
+    test('throw if variable with duplicate name added to the Pipeline', () => {
+      const pipeline = new codepipeline.Pipeline(stack, 'Pipeline', {
+        variables: [variable1],
+      });
+      const duplicated = new codepipeline.Variable({
+        variableName: 'var-name-1',
+        description: 'description-dummy',
+        defaultValue: 'default-dummy',
+      });
+      expect(() => {
+        pipeline.addVariable(duplicated);
+      }).toThrow(/Variable with duplicate name 'var-name-1' added to the Pipeline/);
+    });
   });
 });