diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/aws-cdk-lambda-runtime-inlinecode.assets.json b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/aws-cdk-lambda-runtime-inlinecode.assets.json
index 60c1bee94d14d..451cfcd3f0f27 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/aws-cdk-lambda-runtime-inlinecode.assets.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/aws-cdk-lambda-runtime-inlinecode.assets.json
@@ -1,7 +1,7 @@
 {
   "version": "34.0.0",
   "files": {
-    "4ead45111870c9c1adb03a0aba3c5d2de7b2102d0e62479767984e93f983ebe3": {
+    "ab212011785d32ea6de009fda91d48cf0cd3411ffebcdd7a6b62ccd841c00906": {
       "source": {
         "path": "aws-cdk-lambda-runtime-inlinecode.template.json",
         "packaging": "file"
@@ -9,7 +9,7 @@
       "destinations": {
         "current_account-current_region": {
           "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
-          "objectKey": "4ead45111870c9c1adb03a0aba3c5d2de7b2102d0e62479767984e93f983ebe3.json",
+          "objectKey": "ab212011785d32ea6de009fda91d48cf0cd3411ffebcdd7a6b62ccd841c00906.json",
           "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
         }
       }
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/aws-cdk-lambda-runtime-inlinecode.template.json b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/aws-cdk-lambda-runtime-inlinecode.template.json
index f091c7573b0e8..974dac560fff4 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/aws-cdk-lambda-runtime-inlinecode.template.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/aws-cdk-lambda-runtime-inlinecode.template.json
@@ -399,6 +399,56 @@
    "DependsOn": [
     "NODEJS18XServiceRole4D18036A"
    ]
+  },
+  "NODEJS20XServiceRole188A4E38": {
+   "Type": "AWS::IAM::Role",
+   "Properties": {
+    "AssumeRolePolicyDocument": {
+     "Statement": [
+      {
+       "Action": "sts:AssumeRole",
+       "Effect": "Allow",
+       "Principal": {
+        "Service": "lambda.amazonaws.com"
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    },
+    "ManagedPolicyArns": [
+     {
+      "Fn::Join": [
+       "",
+       [
+        "arn:",
+        {
+         "Ref": "AWS::Partition"
+        },
+        ":iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
+       ]
+      ]
+     }
+    ]
+   }
+  },
+  "NODEJS20X70A25ADE": {
+   "Type": "AWS::Lambda::Function",
+   "Properties": {
+    "Code": {
+     "ZipFile": "exports.handler = async function(event) { return \"success\" }"
+    },
+    "Handler": "index.handler",
+    "Role": {
+     "Fn::GetAtt": [
+      "NODEJS20XServiceRole188A4E38",
+      "Arn"
+     ]
+    },
+    "Runtime": "nodejs20.x"
+   },
+   "DependsOn": [
+    "NODEJS20XServiceRole188A4E38"
+   ]
   }
  },
  "Outputs": {
@@ -441,6 +491,11 @@
    "Value": {
     "Ref": "NODEJS18X7B6E6033"
    }
+  },
+  "NODEJS20XfunctionName": {
+   "Value": {
+    "Ref": "NODEJS20X70A25ADE"
+   }
   }
  },
  "Parameters": {
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/manifest.json b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/manifest.json
index 33639d383ff36..8de8c51ed33f1 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/manifest.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/manifest.json
@@ -18,7 +18,7 @@
         "validateOnSynth": false,
         "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-deploy-role-${AWS::AccountId}-${AWS::Region}",
         "cloudFormationExecutionRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-cfn-exec-role-${AWS::AccountId}-${AWS::Region}",
-        "stackTemplateAssetObjectUrl": "s3://cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}/4ead45111870c9c1adb03a0aba3c5d2de7b2102d0e62479767984e93f983ebe3.json",
+        "stackTemplateAssetObjectUrl": "s3://cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}/ab212011785d32ea6de009fda91d48cf0cd3411ffebcdd7a6b62ccd841c00906.json",
         "requiresBootstrapStackVersion": 6,
         "bootstrapStackVersionSsmParameter": "/cdk-bootstrap/hnb659fds/version",
         "additionalDependencies": [
@@ -106,24 +106,6 @@
             "data": "PYTHON310functionName"
           }
         ],
-        "/aws-cdk-lambda-runtime-inlinecode/PYTHON_3_12/ServiceRole/Resource": [
-          {
-            "type": "aws:cdk:logicalId",
-            "data": "PYTHON312ServiceRoleBEB03378"
-          }
-        ],
-        "/aws-cdk-lambda-runtime-inlinecode/PYTHON_3_12/Resource": [
-          {
-            "type": "aws:cdk:logicalId",
-            "data": "PYTHON3127B62731D"
-          }
-        ],
-        "/aws-cdk-lambda-runtime-inlinecode/PYTHON_3_12-functionName": [
-          {
-            "type": "aws:cdk:logicalId",
-            "data": "PYTHON312functionName"
-          }
-        ],
         "/aws-cdk-lambda-runtime-inlinecode/NODEJS_14_X/ServiceRole/Resource": [
           {
             "type": "aws:cdk:logicalId",
@@ -178,6 +160,24 @@
             "data": "NODEJS18XfunctionName"
           }
         ],
+        "/aws-cdk-lambda-runtime-inlinecode/NODEJS_20_X/ServiceRole/Resource": [
+          {
+            "type": "aws:cdk:logicalId",
+            "data": "NODEJS20XServiceRole188A4E38"
+          }
+        ],
+        "/aws-cdk-lambda-runtime-inlinecode/NODEJS_20_X/Resource": [
+          {
+            "type": "aws:cdk:logicalId",
+            "data": "NODEJS20X70A25ADE"
+          }
+        ],
+        "/aws-cdk-lambda-runtime-inlinecode/NODEJS_20_X-functionName": [
+          {
+            "type": "aws:cdk:logicalId",
+            "data": "NODEJS20XfunctionName"
+          }
+        ],
         "/aws-cdk-lambda-runtime-inlinecode/BootstrapVersion": [
           {
             "type": "aws:cdk:logicalId",
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/tree.json b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/tree.json
index eea90c052289d..db7c32bbc11a6 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/tree.json
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.js.snapshot/tree.json
@@ -800,6 +800,105 @@
               "version": "0.0.0"
             }
           },
+          "NODEJS_20_X": {
+            "id": "NODEJS_20_X",
+            "path": "aws-cdk-lambda-runtime-inlinecode/NODEJS_20_X",
+            "children": {
+              "ServiceRole": {
+                "id": "ServiceRole",
+                "path": "aws-cdk-lambda-runtime-inlinecode/NODEJS_20_X/ServiceRole",
+                "children": {
+                  "ImportServiceRole": {
+                    "id": "ImportServiceRole",
+                    "path": "aws-cdk-lambda-runtime-inlinecode/NODEJS_20_X/ServiceRole/ImportServiceRole",
+                    "constructInfo": {
+                      "fqn": "aws-cdk-lib.Resource",
+                      "version": "0.0.0"
+                    }
+                  },
+                  "Resource": {
+                    "id": "Resource",
+                    "path": "aws-cdk-lambda-runtime-inlinecode/NODEJS_20_X/ServiceRole/Resource",
+                    "attributes": {
+                      "aws:cdk:cloudformation:type": "AWS::IAM::Role",
+                      "aws:cdk:cloudformation:props": {
+                        "assumeRolePolicyDocument": {
+                          "Statement": [
+                            {
+                              "Action": "sts:AssumeRole",
+                              "Effect": "Allow",
+                              "Principal": {
+                                "Service": "lambda.amazonaws.com"
+                              }
+                            }
+                          ],
+                          "Version": "2012-10-17"
+                        },
+                        "managedPolicyArns": [
+                          {
+                            "Fn::Join": [
+                              "",
+                              [
+                                "arn:",
+                                {
+                                  "Ref": "AWS::Partition"
+                                },
+                                ":iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
+                              ]
+                            ]
+                          }
+                        ]
+                      }
+                    },
+                    "constructInfo": {
+                      "fqn": "aws-cdk-lib.aws_iam.CfnRole",
+                      "version": "0.0.0"
+                    }
+                  }
+                },
+                "constructInfo": {
+                  "fqn": "aws-cdk-lib.aws_iam.Role",
+                  "version": "0.0.0"
+                }
+              },
+              "Resource": {
+                "id": "Resource",
+                "path": "aws-cdk-lambda-runtime-inlinecode/NODEJS_20_X/Resource",
+                "attributes": {
+                  "aws:cdk:cloudformation:type": "AWS::Lambda::Function",
+                  "aws:cdk:cloudformation:props": {
+                    "code": {
+                      "zipFile": "exports.handler = async function(event) { return \"success\" }"
+                    },
+                    "handler": "index.handler",
+                    "role": {
+                      "Fn::GetAtt": [
+                        "NODEJS20XServiceRole188A4E38",
+                        "Arn"
+                      ]
+                    },
+                    "runtime": "nodejs20.x"
+                  }
+                },
+                "constructInfo": {
+                  "fqn": "aws-cdk-lib.aws_lambda.CfnFunction",
+                  "version": "0.0.0"
+                }
+              }
+            },
+            "constructInfo": {
+              "fqn": "aws-cdk-lib.aws_lambda.Function",
+              "version": "0.0.0"
+            }
+          },
+          "NODEJS_20_X-functionName": {
+            "id": "NODEJS_20_X-functionName",
+            "path": "aws-cdk-lambda-runtime-inlinecode/NODEJS_20_X-functionName",
+            "constructInfo": {
+              "fqn": "aws-cdk-lib.CfnOutput",
+              "version": "0.0.0"
+            }
+          },
           "BootstrapVersion": {
             "id": "BootstrapVersion",
             "path": "aws-cdk-lambda-runtime-inlinecode/BootstrapVersion",
diff --git a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.ts b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.ts
index ac663c18f9e7b..3411babefaaeb 100644
--- a/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.ts
+++ b/packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.runtime.inlinecode.ts
@@ -71,4 +71,11 @@ const node18xfn = new Function(stack, 'NODEJS_18_X', {
 });
 new CfnOutput(stack, 'NODEJS_18_X-functionName', { value: node18xfn.functionName });
 
+const node20xfn = new Function(stack, 'NODEJS_20_X', {
+  code: new InlineCode('exports.handler = async function(event) { return "success" }'),
+  handler: 'index.handler',
+  runtime: Runtime.NODEJS_20_X,
+});
+new CfnOutput(stack, 'NODEJS_20_X-functionName', { value: node20xfn.functionName });
+
 app.synth();
diff --git a/packages/aws-cdk-lib/aws-lambda/lib/runtime.ts b/packages/aws-cdk-lib/aws-lambda/lib/runtime.ts
index 1727a7e565c63..734f895031d77 100644
--- a/packages/aws-cdk-lib/aws-lambda/lib/runtime.ts
+++ b/packages/aws-cdk-lib/aws-lambda/lib/runtime.ts
@@ -104,6 +104,11 @@ export class Runtime {
    */
   public static readonly NODEJS_18_X = new Runtime('nodejs18.x', RuntimeFamily.NODEJS, { supportsInlineCode: true });
 
+  /**
+   * The NodeJS 20.x runtime (nodejs20.x)
+   */
+  public static readonly NODEJS_20_X = new Runtime('nodejs20.x', RuntimeFamily.NODEJS, { supportsInlineCode: true });
+
   /**
    * The latest NodeJS version currently available
    */