diff --git a/packages/injectable/core/index.d.ts b/packages/injectable/core/index.d.ts
index 9e1607df..65acaf1f 100644
--- a/packages/injectable/core/index.d.ts
+++ b/packages/injectable/core/index.d.ts
@@ -195,6 +195,7 @@ export interface DiContainerForInjection {
   deregister(...injectables: Injectable<any, any, any>[]): void;
   context: ContextItem[];
   getInstances: GetInstances;
+  sourceNamespace: string | undefined;
 }
 
 export interface ILifecycle<InstantiationParam> {
diff --git a/packages/injectable/core/index.test-d.ts b/packages/injectable/core/index.test-d.ts
index a31cca49..39bf1d39 100644
--- a/packages/injectable/core/index.test-d.ts
+++ b/packages/injectable/core/index.test-d.ts
@@ -482,3 +482,22 @@ di.unoverride(someInjectable);
 
 // given injectable, when unoverridden using injectionToken, typing is ok.
 di.unoverride(someStringInjectionToken);
+
+// given keyed singleton with sourceNamespace as key, typing is ok
+const someKeyedSingletonWithSourceNamespaceAsKey = getInjectable({
+  id: 'some-keyed-singleton-with-source-namespace-as-key',
+
+  instantiate: di => {
+    expectType<string | undefined>(di.sourceNamespace);
+
+    return di.sourceNamespace;
+  },
+
+  lifecycle: lifecycleEnum.keyedSingleton({
+    getInstanceKey: di => {
+      expectType<string | undefined>(di.sourceNamespace);
+
+      return di.sourceNamespace;
+    },
+  }),
+});
diff --git a/packages/injectable/core/src/dependency-injection-container/createContainer.js b/packages/injectable/core/src/dependency-injection-container/createContainer.js
index fce6d0a6..8586045a 100644
--- a/packages/injectable/core/src/dependency-injection-container/createContainer.js
+++ b/packages/injectable/core/src/dependency-injection-container/createContainer.js
@@ -96,6 +96,7 @@ export default (containerId, { detectCycles = true } = {}) => {
     getDi: () => privateDi,
     checkForNoMatches,
     checkForSideEffects,
+    getNamespacedId,
   });
 
   const decoratedPrivateInject = withInjectionDecorators(
diff --git a/packages/injectable/core/src/dependency-injection-container/privateInjectFor.js b/packages/injectable/core/src/dependency-injection-container/privateInjectFor.js
index 5e639f03..58545c26 100644
--- a/packages/injectable/core/src/dependency-injection-container/privateInjectFor.js
+++ b/packages/injectable/core/src/dependency-injection-container/privateInjectFor.js
@@ -11,8 +11,9 @@ export const privateInjectFor =
     getDi,
     checkForNoMatches,
     checkForSideEffects,
+    getNamespacedId,
   }) =>
-  (alias, instantiationParameter, context = []) => {
+  (alias, instantiationParameter, context = [], source) => {
     const di = getDi();
 
     const relatedInjectables = getRelatedInjectables(alias);
@@ -36,6 +37,8 @@ export const privateInjectFor =
       instantiationParameter,
       context,
       instancesByInjectableMap,
+      source,
+      getNamespacedId,
     });
   };
 
@@ -45,6 +48,8 @@ const getInstance = ({
   instantiationParameter,
   context: oldContext,
   instancesByInjectableMap,
+  source,
+  getNamespacedId,
 }) => {
   const newContext = [
     ...oldContext,
@@ -97,6 +102,12 @@ const getInstance = ({
         source: injectableToBeInstantiated,
       });
     },
+
+    get sourceNamespace() {
+      return (
+        getNamespacedId(source).split(':').slice(0, -1).join(':') || undefined
+      );
+    },
   };
 
   const instanceKey = injectableToBeInstantiated.lifecycle.getInstanceKey(
diff --git a/packages/injectable/core/src/scenarios/access-to-namespace.test.js b/packages/injectable/core/src/scenarios/access-to-namespace.test.js
new file mode 100644
index 00000000..7f78d8a8
--- /dev/null
+++ b/packages/injectable/core/src/scenarios/access-to-namespace.test.js
@@ -0,0 +1,173 @@
+import getInjectable from '../getInjectable/getInjectable';
+import createContainer from '../dependency-injection-container/createContainer';
+import lifecycleEnum from '../dependency-injection-container/lifecycleEnum';
+import { getInjectionToken } from '@ogre-tools/injectable';
+
+describe('access-to-namespace', () => {
+  it('given keyed singleton using source namespace as the key, when injected from different scopes, injected instances are scope-specific', () => {
+    const di = createContainer('irrelevant');
+
+    const someSourceNamespaceSpecificInjectionToken = getInjectionToken({
+      id: 'some-injection-token',
+    });
+
+    const someSourceNamespaceSpecificInjectable = getInjectable({
+      id: 'some-source-namespace-specific',
+      instantiate: di => message =>
+        di.sourceNamespace ? `${di.sourceNamespace}/${message}` : message,
+
+      lifecycle: lifecycleEnum.keyedSingleton({
+        getInstanceKey: di => di.sourceNamespace,
+      }),
+
+      injectionToken: someSourceNamespaceSpecificInjectionToken,
+    });
+
+    const registerInjectableInScope1Injectable = getInjectable({
+      id: 'scope-1',
+      instantiate: di => injectable => di.register(injectable),
+      scope: true,
+    });
+
+    const someFunctionalityInScope1Injectable = getInjectable({
+      id: 'some-functionality-in-scope-1',
+      instantiate: di => di.inject(someSourceNamespaceSpecificInjectionToken),
+    });
+
+    const registerInjectableInScope2Injectable = getInjectable({
+      id: 'scope-2',
+      instantiate: di => injectable => di.register(injectable),
+      scope: true,
+    });
+
+    const someFunctionalityInScope2Injectable = getInjectable({
+      id: 'register-injectable-in-scope-2',
+      instantiate: di => di.inject(someSourceNamespaceSpecificInjectionToken),
+    });
+
+    const someFunctionalityInRootScopeInjectable = getInjectable({
+      id: 'some-functionality-in-root-scope',
+      instantiate: di => di.inject(someSourceNamespaceSpecificInjectionToken),
+    });
+
+    di.register(
+      registerInjectableInScope1Injectable,
+      registerInjectableInScope2Injectable,
+    );
+
+    const registerInjectableInScope1 = di.inject(
+      registerInjectableInScope1Injectable,
+    );
+
+    const registerInjectableInScope2 = di.inject(
+      registerInjectableInScope2Injectable,
+    );
+
+    di.register(someSourceNamespaceSpecificInjectable);
+    registerInjectableInScope1(someFunctionalityInScope1Injectable);
+    registerInjectableInScope2(someFunctionalityInScope2Injectable);
+    di.register(someFunctionalityInRootScopeInjectable);
+
+    expect([
+      di.inject(someFunctionalityInScope1Injectable)('some-value'),
+      di.inject(someFunctionalityInScope2Injectable)('some-other-value'),
+      di.inject(someFunctionalityInRootScopeInjectable)(
+        'some-value-without-namespace',
+      ),
+    ]).toEqual([
+      'scope-1/some-value',
+      'scope-2/some-other-value',
+      'some-value-without-namespace',
+    ]);
+  });
+
+  it('given keyed singleton using source namespace as the key, when injected from nested scopes, injected instances are scope-specific', () => {
+    const di = createContainer('irrelevant');
+
+    const someSourceNamespaceSpecificInjectionToken = getInjectionToken({
+      id: 'some-injection-token',
+    });
+
+    const someSourceNamespaceSpecificInjectable = getInjectable({
+      id: 'some-source-namespace-specific',
+
+      instantiate: di => message => `${di.sourceNamespace}/${message}`,
+
+      lifecycle: lifecycleEnum.keyedSingleton({
+        getInstanceKey: di => di.sourceNamespace,
+      }),
+
+      injectionToken: someSourceNamespaceSpecificInjectionToken,
+    });
+
+    const registerInjectableInScope1Injectable = getInjectable({
+      id: 'scope-1',
+      instantiate: di => injectable => di.register(injectable),
+      scope: true,
+    });
+
+    const registerInjectableInNestedScope1Injectable = getInjectable({
+      id: 'nested-scope-1',
+      instantiate: di => injectable => di.register(injectable),
+      scope: true,
+    });
+
+    const someFunctionalityInNestedScope1Injectable = getInjectable({
+      id: 'some-functionality-in-scope-1',
+      instantiate: di => di.inject(someSourceNamespaceSpecificInjectionToken),
+    });
+
+    const registerInjectableInScope2Injectable = getInjectable({
+      id: 'scope-2',
+      instantiate: di => injectable => di.register(injectable),
+      scope: true,
+    });
+
+    const registerInjectableInNestedScope2Injectable = getInjectable({
+      id: 'nested-scope-2',
+      instantiate: di => injectable => di.register(injectable),
+      scope: true,
+    });
+
+    const someFunctionalityInNestedScope2Injectable = getInjectable({
+      id: 'register-injectable-in-scope-2',
+      instantiate: di => di.inject(someSourceNamespaceSpecificInjectionToken),
+    });
+
+    di.register(
+      registerInjectableInScope1Injectable,
+      registerInjectableInScope2Injectable,
+    );
+
+    const registerInjectableInScope1 = di.inject(
+      registerInjectableInScope1Injectable,
+    );
+
+    const registerInjectableInScope2 = di.inject(
+      registerInjectableInScope2Injectable,
+    );
+
+    registerInjectableInScope1(registerInjectableInNestedScope1Injectable);
+    registerInjectableInScope2(registerInjectableInNestedScope2Injectable);
+
+    const registerInjectableInNestedScope1 = di.inject(
+      registerInjectableInNestedScope1Injectable,
+    );
+
+    const registerInjectableInNestedScope2 = di.inject(
+      registerInjectableInNestedScope2Injectable,
+    );
+
+    di.register(someSourceNamespaceSpecificInjectable);
+    registerInjectableInNestedScope1(someFunctionalityInNestedScope1Injectable);
+    registerInjectableInNestedScope2(someFunctionalityInNestedScope2Injectable);
+
+    expect([
+      di.inject(someFunctionalityInNestedScope1Injectable)('some-value'),
+      di.inject(someFunctionalityInNestedScope2Injectable)('some-other-value'),
+    ]).toEqual([
+      'scope-1:nested-scope-1/some-value',
+      'scope-2:nested-scope-2/some-other-value',
+    ]);
+  });
+});