diff --git a/packages/@n8n/nodes-langchain/credentials/OllamaApi.credentials.ts b/packages/@n8n/nodes-langchain/credentials/OllamaApi.credentials.ts
index acfbbcd3f9..3d030753c8 100644
--- a/packages/@n8n/nodes-langchain/credentials/OllamaApi.credentials.ts
+++ b/packages/@n8n/nodes-langchain/credentials/OllamaApi.credentials.ts
@@ -1,4 +1,9 @@
-import type { ICredentialTestRequest, ICredentialType, INodeProperties } from 'n8n-workflow';
+import type {
+	ICredentialTestRequest,
+	ICredentialType,
+	INodeProperties,
+	IAuthenticateGeneric,
+} from 'n8n-workflow';
 
 export class OllamaApi implements ICredentialType {
 	name = 'ollamaApi';
@@ -15,12 +20,30 @@ export class OllamaApi implements ICredentialType {
 			type: 'string',
 			default: 'http://localhost:11434',
 		},
+		{
+			displayName: 'API Key',
+			hint: 'When using Ollama behind a proxy with authentication (such as Open WebUI), provide the Bearer token/API key here. This is not required for the default Ollama installation',
+			name: 'apiKey',
+			type: 'string',
+			typeOptions: { password: true },
+			default: '',
+			required: false,
+		},
 	];
 
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			headers: {
+				Authorization: '=Bearer {{$credentials.apiKey}}',
+			},
+		},
+	};
+
 	test: ICredentialTestRequest = {
 		request: {
 			baseURL: '={{ $credentials.baseUrl }}',
-			url: '/',
+			url: '/api/tags',
 			method: 'GET',
 		},
 	};
diff --git a/packages/@n8n/nodes-langchain/nodes/embeddings/EmbeddingsOllama/EmbeddingsOllama.node.ts b/packages/@n8n/nodes-langchain/nodes/embeddings/EmbeddingsOllama/EmbeddingsOllama.node.ts
index 86a2a9174f..3fb174181f 100644
--- a/packages/@n8n/nodes-langchain/nodes/embeddings/EmbeddingsOllama/EmbeddingsOllama.node.ts
+++ b/packages/@n8n/nodes-langchain/nodes/embeddings/EmbeddingsOllama/EmbeddingsOllama.node.ts
@@ -49,10 +49,16 @@ export class EmbeddingsOllama implements INodeType {
 		this.logger.debug('Supply data for embeddings Ollama');
 		const modelName = this.getNodeParameter('model', itemIndex) as string;
 		const credentials = await this.getCredentials('ollamaApi');
+		const headers = credentials.apiKey
+			? {
+					Authorization: `Bearer ${credentials.apiKey as string}`,
+				}
+			: undefined;
 
 		const embeddings = new OllamaEmbeddings({
 			baseUrl: credentials.baseUrl as string,
 			model: modelName,
+			headers,
 		});
 
 		return {
diff --git a/packages/@n8n/nodes-langchain/nodes/llms/LMChatOllama/LmChatOllama.node.ts b/packages/@n8n/nodes-langchain/nodes/llms/LMChatOllama/LmChatOllama.node.ts
index 23734a75cd..026da50349 100644
--- a/packages/@n8n/nodes-langchain/nodes/llms/LMChatOllama/LmChatOllama.node.ts
+++ b/packages/@n8n/nodes-langchain/nodes/llms/LMChatOllama/LmChatOllama.node.ts
@@ -58,6 +58,11 @@ export class LmChatOllama implements INodeType {
 
 		const modelName = this.getNodeParameter('model', itemIndex) as string;
 		const options = this.getNodeParameter('options', itemIndex, {}) as ChatOllamaInput;
+		const headers = credentials.apiKey
+			? {
+					Authorization: `Bearer ${credentials.apiKey as string}`,
+				}
+			: undefined;
 
 		const model = new ChatOllama({
 			...options,
@@ -66,6 +71,7 @@ export class LmChatOllama implements INodeType {
 			format: options.format === 'default' ? undefined : options.format,
 			callbacks: [new N8nLlmTracing(this)],
 			onFailedAttempt: makeN8nLlmFailedAttemptHandler(this),
+			headers,
 		});
 
 		return {
diff --git a/packages/@n8n/nodes-langchain/nodes/llms/LMOllama/LmOllama.node.ts b/packages/@n8n/nodes-langchain/nodes/llms/LMOllama/LmOllama.node.ts
index 6dbad1aaaa..540c0c0cab 100644
--- a/packages/@n8n/nodes-langchain/nodes/llms/LMOllama/LmOllama.node.ts
+++ b/packages/@n8n/nodes-langchain/nodes/llms/LMOllama/LmOllama.node.ts
@@ -57,6 +57,11 @@ export class LmOllama implements INodeType {
 
 		const modelName = this.getNodeParameter('model', itemIndex) as string;
 		const options = this.getNodeParameter('options', itemIndex, {}) as object;
+		const headers = credentials.apiKey
+			? {
+					Authorization: `Bearer ${credentials.apiKey as string}`,
+				}
+			: undefined;
 
 		const model = new Ollama({
 			baseUrl: credentials.baseUrl as string,
@@ -64,6 +69,7 @@ export class LmOllama implements INodeType {
 			...options,
 			callbacks: [new N8nLlmTracing(this)],
 			onFailedAttempt: makeN8nLlmFailedAttemptHandler(this),
+			headers,
 		});
 
 		return {