diff --git a/src/language/validation/other/modules.ts b/src/language/validation/other/modules.ts
index 2dcc94590..6de62f1e3 100644
--- a/src/language/validation/other/modules.ts
+++ b/src/language/validation/other/modules.ts
@@ -1,23 +1,12 @@
 import { ValidationAcceptor } from 'langium';
 import { isSdsDeclaration, isSdsPipeline, isSdsSegment, SdsDeclaration, SdsModule } from '../../generated/ast.js';
 import { isInPipelineFile, isInStubFile } from '../../helpers/fileExtensions.js';
+import { getModuleMembers } from '../../helpers/nodeProperties.js';
 
-export const CODE_MODULE_MISSING_PACKAGE = 'module/missing-package';
 export const CODE_MODULE_FORBIDDEN_IN_PIPELINE_FILE = 'module/forbidden-in-pipeline-file';
 export const CODE_MODULE_FORBIDDEN_IN_STUB_FILE = 'module/forbidden-in-stub-file';
-
-export const moduleWithDeclarationsMustStatePackage = (node: SdsModule, accept: ValidationAcceptor): void => {
-    if (!node.name) {
-        const declarations = node.members.filter(isSdsDeclaration);
-        if (declarations.length > 0) {
-            accept('error', 'A module with declarations must state its package.', {
-                node: declarations[0],
-                property: 'name',
-                code: CODE_MODULE_MISSING_PACKAGE,
-            });
-        }
-    }
-};
+export const CODE_MODULE_MISSING_PACKAGE = 'module/missing-package';
+export const CODE_MODULE_PIPELINE_FILE_IN_SAFEDS_PACKAGE = 'module/pipeline-file-in-safeds-package';
 
 export const moduleDeclarationsMustMatchFileKind = (node: SdsModule, accept: ValidationAcceptor): void => {
     const declarations = node.members.filter(isSdsDeclaration);
@@ -52,3 +41,26 @@ export const declarationIsAllowedInPipelineFile = (declaration: SdsDeclaration):
 export const declarationIsAllowedInStubFile = (declaration: SdsDeclaration): boolean => {
     return !isSdsPipeline(declaration) && !isSdsSegment(declaration);
 };
+
+export const moduleWithDeclarationsMustStatePackage = (node: SdsModule, accept: ValidationAcceptor): void => {
+    if (!node.name) {
+        const members = getModuleMembers(node);
+        if (members.length > 0) {
+            accept('error', 'A module with declarations must state its package.', {
+                node: members[0],
+                property: 'name',
+                code: CODE_MODULE_MISSING_PACKAGE,
+            });
+        }
+    }
+};
+
+export const pipelineFileMustNotBeInSafedsPackage = (node: SdsModule, accept: ValidationAcceptor): void => {
+    if (isInPipelineFile(node) && node.name?.startsWith('safeds')) {
+        accept('error', "A pipeline file must not be in a 'safeds' package.", {
+            node,
+            property: 'name',
+            code: CODE_MODULE_PIPELINE_FILE_IN_SAFEDS_PACKAGE,
+        });
+    }
+};
diff --git a/src/language/validation/safe-ds-validator.ts b/src/language/validation/safe-ds-validator.ts
index a9ef8c3cc..bf67e2ee4 100644
--- a/src/language/validation/safe-ds-validator.ts
+++ b/src/language/validation/safe-ds-validator.ts
@@ -50,7 +50,11 @@ import {
     parameterMustHaveTypeHint,
     resultMustHaveTypeHint,
 } from './types.js';
-import { moduleDeclarationsMustMatchFileKind, moduleWithDeclarationsMustStatePackage } from './other/modules.js';
+import {
+    moduleDeclarationsMustMatchFileKind,
+    moduleWithDeclarationsMustStatePackage,
+    pipelineFileMustNotBeInSafedsPackage,
+} from './other/modules.js';
 import { typeParameterConstraintLeftOperandMustBeOwnTypeParameter } from './other/declarations/typeParameterConstraints.js';
 import { parameterListMustNotHaveRequiredParametersAfterOptionalParameters } from './other/declarations/parameterLists.js';
 import { unionTypeMustHaveTypes, unionTypeShouldNotHaveDuplicateTypes } from './other/types/unionTypes.js';
@@ -228,6 +232,7 @@ export const registerValidationChecks = function (services: SafeDsServices) {
             moduleMemberMustHaveNameThatIsUniqueInPackage(services),
             moduleMustContainUniqueNames,
             moduleWithDeclarationsMustStatePackage,
+            pipelineFileMustNotBeInSafedsPackage,
             pythonModuleShouldDifferFromSafeDsPackage(services),
         ],
         SdsNamedType: [
diff --git a/tests/resources/validation/other/modules/pipeline files must not be in safeds package/pipe elsewhere.sdspipe b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/pipe elsewhere.sdspipe
new file mode 100644
index 000000000..f193b218b
--- /dev/null
+++ b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/pipe elsewhere.sdspipe	
@@ -0,0 +1,3 @@
+// $TEST$ no error "A pipeline file must not be in a 'safeds' package."
+
+package »tests.validation.other.modules.pipelineFilesMustNotBeInSafedsPackage«
diff --git a/tests/resources/validation/other/modules/pipeline files must not be in safeds package/pipe in safeds.sdspipe b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/pipe in safeds.sdspipe
new file mode 100644
index 000000000..01bbbb021
--- /dev/null
+++ b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/pipe in safeds.sdspipe	
@@ -0,0 +1,3 @@
+// $TEST$ error "A pipeline file must not be in a 'safeds' package."
+
+package »safeds«
diff --git a/tests/resources/validation/other/modules/pipeline files must not be in safeds package/pipe in subpackage of safeds.sdspipe b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/pipe in subpackage of safeds.sdspipe
new file mode 100644
index 000000000..84d64908d
--- /dev/null
+++ b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/pipe in subpackage of safeds.sdspipe	
@@ -0,0 +1,3 @@
+// $TEST$ error "A pipeline file must not be in a 'safeds' package."
+
+package »safeds.validation.other.modules.pipelineFilesMustNotBeInSafedsPackage«
diff --git a/tests/resources/validation/other/modules/pipeline files must not be in safeds package/stub elsewhere.sdsstub b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/stub elsewhere.sdsstub
new file mode 100644
index 000000000..f193b218b
--- /dev/null
+++ b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/stub elsewhere.sdsstub	
@@ -0,0 +1,3 @@
+// $TEST$ no error "A pipeline file must not be in a 'safeds' package."
+
+package »tests.validation.other.modules.pipelineFilesMustNotBeInSafedsPackage«
diff --git a/tests/resources/validation/other/modules/pipeline files must not be in safeds package/stub in safeds.sdsstub b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/stub in safeds.sdsstub
new file mode 100644
index 000000000..07eecbb35
--- /dev/null
+++ b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/stub in safeds.sdsstub	
@@ -0,0 +1,3 @@
+// $TEST$ no error "A pipeline file must not be in a 'safeds' package."
+
+package »safeds«
diff --git a/tests/resources/validation/other/modules/pipeline files must not be in safeds package/stub in subpackage of safeds.sdsstub b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/stub in subpackage of safeds.sdsstub
new file mode 100644
index 000000000..0724b7d84
--- /dev/null
+++ b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/stub in subpackage of safeds.sdsstub	
@@ -0,0 +1,3 @@
+// $TEST$ no error "A pipeline file must not be in a 'safeds' package."
+
+package »safeds.validation.other.modules.pipelineFilesMustNotBeInSafedsPackage«
diff --git a/tests/resources/validation/other/modules/pipeline files must not be in safeds package/test elsewhere.sdstest b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/test elsewhere.sdstest
new file mode 100644
index 000000000..f193b218b
--- /dev/null
+++ b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/test elsewhere.sdstest	
@@ -0,0 +1,3 @@
+// $TEST$ no error "A pipeline file must not be in a 'safeds' package."
+
+package »tests.validation.other.modules.pipelineFilesMustNotBeInSafedsPackage«
diff --git a/tests/resources/validation/other/modules/pipeline files must not be in safeds package/test in safeds.sdstest b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/test in safeds.sdstest
new file mode 100644
index 000000000..07eecbb35
--- /dev/null
+++ b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/test in safeds.sdstest	
@@ -0,0 +1,3 @@
+// $TEST$ no error "A pipeline file must not be in a 'safeds' package."
+
+package »safeds«
diff --git a/tests/resources/validation/other/modules/pipeline files must not be in safeds package/test in subpackage of safeds.sdstest b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/test in subpackage of safeds.sdstest
new file mode 100644
index 000000000..0724b7d84
--- /dev/null
+++ b/tests/resources/validation/other/modules/pipeline files must not be in safeds package/test in subpackage of safeds.sdstest	
@@ -0,0 +1,3 @@
+// $TEST$ no error "A pipeline file must not be in a 'safeds' package."
+
+package »safeds.validation.other.modules.pipelineFilesMustNotBeInSafedsPackage«