diff --git a/api/apps/llm_app.py b/api/apps/llm_app.py
index 1f46a4098..e77b90506 100644
--- a/api/apps/llm_app.py
+++ b/api/apps/llm_app.py
@@ -157,7 +157,7 @@ async def add_llm():
     elif factory == "Bedrock":
         # For Bedrock, due to its special authentication method
         # Assemble bedrock_ak, bedrock_sk, bedrock_region
-        api_key = apikey_json(["bedrock_ak", "bedrock_sk", "bedrock_region"])
+        api_key = apikey_json(["auth_mode", "bedrock_ak", "bedrock_sk", "bedrock_region", "aws_role_arn"])
 
     elif factory == "LocalAI":
         llm_name += "___LocalAI"
diff --git a/rag/llm/chat_model.py b/rag/llm/chat_model.py
index 7c8e2476e..e1451c00d 100644
--- a/rag/llm/chat_model.py
+++ b/rag/llm/chat_model.py
@@ -1217,11 +1217,7 @@ class LiteLLMBase(ABC):
         self.toolcall_sessions = {}
 
         # Factory specific fields
-        if self.provider == SupportedLiteLLMProvider.Bedrock:
-            self.bedrock_ak = json.loads(key).get("bedrock_ak", "")
-            self.bedrock_sk = json.loads(key).get("bedrock_sk", "")
-            self.bedrock_region = json.loads(key).get("bedrock_region", "")
-        elif self.provider == SupportedLiteLLMProvider.OpenRouter:
+        if self.provider == SupportedLiteLLMProvider.OpenRouter:
             self.api_key = json.loads(key).get("api_key", "")
             self.provider_order = json.loads(key).get("provider_order", "")
         elif self.provider == SupportedLiteLLMProvider.Azure_OpenAI:
@@ -1624,17 +1620,38 @@ class LiteLLMBase(ABC):
         if self.provider in FACTORY_DEFAULT_BASE_URL:
             completion_args.update({"api_base": self.base_url})
         elif self.provider == SupportedLiteLLMProvider.Bedrock:
+            import boto3
+
             completion_args.pop("api_key", None)
             completion_args.pop("api_base", None)
-            bedrock_credentials = { "aws_region_name": self.bedrock_region }
-            if self.bedrock_ak and self.bedrock_sk:
-                bedrock_credentials["aws_access_key_id"] = self.bedrock_ak
-                bedrock_credentials["aws_secret_access_key"] = self.bedrock_sk
+
+            bedrock_key = json.loads(self.api_key)
+            mode = bedrock_key.get("auth_mode")
+            if not mode:
+                logging.error("Bedrock auth_mode is not provided in the key")
+                raise ValueError("Bedrock auth_mode must be provided in the key")
+
+            bedrock_region = bedrock_key.get("bedrock_region")
+            bedrock_credentials = {"bedrock_region": bedrock_region}
+
+            if mode == "access_key_secret":
+                bedrock_credentials["aws_access_key_id"] = bedrock_key.get("bedrock_ak")
+                bedrock_credentials["aws_secret_access_key"] = bedrock_key.get("bedrock_sk")
+            elif mode == "iam_role":
+                aws_role_arn = bedrock_key.get("aws_role_arn")
+                sts_client = boto3.client("sts", region_name=bedrock_region)
+                resp = sts_client.assume_role(RoleArn=aws_role_arn, RoleSessionName="BedrockSession")
+                creds = resp["Credentials"]
+                bedrock_credentials["aws_access_key_id"] = creds["AccessKeyId"]
+                bedrock_credentials["aws_secret_access_key"] = creds["SecretAccessKey"]
+                bedrock_credentials["aws_session_token"] = creds["SessionToken"]
+
             completion_args.update(
                 {
                     "bedrock_credentials": bedrock_credentials,
                 }
             )
+
         elif self.provider == SupportedLiteLLMProvider.OpenRouter:
             if self.provider_order:
 
diff --git a/rag/llm/embedding_model.py b/rag/llm/embedding_model.py
index bf6559960..24b312df2 100644
--- a/rag/llm/embedding_model.py
+++ b/rag/llm/embedding_model.py
@@ -463,20 +463,44 @@ class BedrockEmbed(Base):
 
     def __init__(self, key, model_name, **kwargs):
         import boto3
+        # `key` protocol (backend stores as JSON string in `api_key`):
+        # - Must decode into a dict.
+        # - Required: `auth_mode`, `bedrock_region`.
+        # - Supported auth modes:
+        #   - "access_key_secret": requires `bedrock_ak` + `bedrock_sk`.
+        #   - "iam_role": requires `aws_role_arn` and assumes role via STS.
+        #   - else: treated as "assume_role" (default AWS credential chain).
+        key = json.loads(key)
+        mode = key.get("auth_mode")
+        if not mode:
+            logging.error("Bedrock auth_mode is not provided in the key")
+            raise ValueError("Bedrock auth_mode must be provided in the key")
+
+        self.bedrock_region = key.get("bedrock_region")
 
-        self.bedrock_ak = json.loads(key).get("bedrock_ak", "")
-        self.bedrock_sk = json.loads(key).get("bedrock_sk", "")
-        self.bedrock_region = json.loads(key).get("bedrock_region", "")
         self.model_name = model_name
         self.is_amazon = self.model_name.split(".")[0] == "amazon"
         self.is_cohere = self.model_name.split(".")[0] == "cohere"
-
-        if self.bedrock_ak == "" or self.bedrock_sk == "":
-            # Try to create a client using the default credentials if ak/sk are not provided.
-            # Must provide a region.
-            self.client = boto3.client("bedrock-runtime", region_name=self.bedrock_region)
-        else:
+        
+        if mode == "access_key_secret":
+            self.bedrock_ak = key.get("bedrock_ak")
+            self.bedrock_sk = key.get("bedrock_sk")
             self.client = boto3.client(service_name="bedrock-runtime", region_name=self.bedrock_region, aws_access_key_id=self.bedrock_ak, aws_secret_access_key=self.bedrock_sk)
+        elif mode == "iam_role":
+            self.aws_role_arn = key.get("aws_role_arn")
+            sts_client = boto3.client("sts", region_name=self.bedrock_region)
+            resp = sts_client.assume_role(RoleArn=self.aws_role_arn, RoleSessionName="BedrockSession")
+            creds = resp["Credentials"]
+
+            self.client = boto3.client(
+                service_name="bedrock-runtime",
+                aws_access_key_id=creds["AccessKeyId"],
+                aws_secret_access_key=creds["SecretAccessKey"],
+                aws_session_token=creds["SessionToken"],
+            )
+        else: # assume_role
+            self.client = boto3.client("bedrock-runtime", region_name=self.bedrock_region)
+
 
     def encode(self, texts: list):
         texts = [truncate(t, 8196) for t in texts]
diff --git a/web/src/locales/en.ts b/web/src/locales/en.ts
index 0d9ee1fa1..e3d5affc9 100644
--- a/web/src/locales/en.ts
+++ b/web/src/locales/en.ts
@@ -787,6 +787,15 @@ This auto-tagging feature enhances retrieval by adding another layer of domain-s
       deleteModel: 'Delete model',
       bedrockCredentialsHint:
         'Tip: Leave Access Key / Secret Key blank to use AWS IAM authentication.',
+      awsAuthModeAccessKeySecret: 'Access Key',
+      awsAuthModeIamRole: 'IAM Role',
+      awsAuthModeAssumeRole: 'Assume Role',
+      awsAccessKeyId: 'AWS Access Key ID',
+      awsSecretAccessKey: 'AWS Secret Access Key',
+      awsRoleArn: 'AWS Role ARN',
+      awsRoleArnMessage: 'Please enter AWS Role ARN',
+      awsAssumeRoleTip:
+        'If you select this mode, the Amazon EC2 instance will assume its existing role to access AWS services. No additional credentials are required.',
       modelEmptyTip:
         'No models available. <br>Please add models from the panel on the right.',
       sourceEmptyTip: 'No data sources added yet. Select one below to connect.',
diff --git a/web/src/locales/zh-traditional.ts b/web/src/locales/zh-traditional.ts
index 1c5f40b6f..0eaf5f436 100644
--- a/web/src/locales/zh-traditional.ts
+++ b/web/src/locales/zh-traditional.ts
@@ -546,6 +546,15 @@ export default {
       profileDescription: '在此更新您的照片和個人詳細信息。',
       bedrockCredentialsHint:
         '提示：Access Key / Secret Key 可留空，以啟用 AWS IAM 自動驗證。',
+      awsAuthModeAccessKeySecret: 'Access Key 和 Secret',
+      awsAuthModeIamRole: 'IAM Role',
+      awsAuthModeAssumeRole: 'Assume Role',
+      awsAccessKeyId: 'AWS Access Key ID',
+      awsSecretAccessKey: 'AWS Secret Access Key',
+      awsRoleArn: 'AWS Role ARN',
+      awsRoleArnMessage: '請輸入 AWS Role ARN',
+      awsAssumeRoleTip:
+        '選擇此模式後，EC2 執行個體將使用其既有的 IAM Role 存取 AWS 服務，無需額外憑證。',
       maxTokens: '最大token數',
       maxTokensMessage: '最大token數是必填項',
       maxTokensTip:
diff --git a/web/src/locales/zh.ts b/web/src/locales/zh.ts
index c1a5426e8..828dc5882 100644
--- a/web/src/locales/zh.ts
+++ b/web/src/locales/zh.ts
@@ -876,6 +876,15 @@ General：实体和关系提取提示来自 GitHub - microsoft/graphrag：基于
       bedrockAKMessage: '请输入 ACCESS KEY',
       addBedrockSK: 'SECRET KEY',
       bedrockSKMessage: '请输入 SECRET KEY',
+      awsAuthModeAccessKeySecret: 'Access Key 和 Secret',
+      awsAuthModeIamRole: 'IAM Role',
+      awsAuthModeAssumeRole: 'Assume Role',
+      awsAccessKeyId: 'AWS Access Key ID',
+      awsSecretAccessKey: 'AWS Secret Access Key',
+      awsRoleArn: 'AWS Role ARN',
+      awsRoleArnMessage: '请输入 AWS Role ARN',
+      awsAssumeRoleTip:
+        '选择此模式后，EC2 实例将使用其已有的 IAM Role 访问 AWS 服务，无需额外的凭证。',
       bedrockRegion: 'AWS Region',
       bedrockRegionMessage: '请选择！',
       'us-east-1': '美国东部 (弗吉尼亚北部)',
diff --git a/web/src/pages/user-setting/setting-model/modal/bedrock-modal/index.tsx b/web/src/pages/user-setting/setting-model/modal/bedrock-modal/index.tsx
index 2127701a3..6a610d34a 100644
--- a/web/src/pages/user-setting/setting-model/modal/bedrock-modal/index.tsx
+++ b/web/src/pages/user-setting/setting-model/modal/bedrock-modal/index.tsx
@@ -1,15 +1,25 @@
 import { useTranslate } from '@/hooks/common-hooks';
 import { IModalProps } from '@/interfaces/common';
 import { IAddLlmRequestBody } from '@/interfaces/request/llm';
-import { Form, Input, InputNumber, Modal, Select, Typography } from 'antd';
-import { useMemo } from 'react';
+import {
+  Form,
+  Input,
+  InputNumber,
+  Modal,
+  Segmented,
+  Select,
+  Typography,
+} from 'antd';
+import { useMemo, useState } from 'react';
 import { LLMHeader } from '../../components/llm-header';
 import { BedrockRegionList } from '../../constant';
 
 type FieldType = IAddLlmRequestBody & {
+  auth_mode?: 'access_key_secret' | 'iam_role' | 'assume_role';
   bedrock_ak: string;
   bedrock_sk: string;
   bedrock_region: string;
+  aws_role_arn?: string;
 };
 
 const { Option } = Select;
@@ -23,6 +33,8 @@ const BedrockModal = ({
   llmFactory,
 }: IModalProps<IAddLlmRequestBody> & { llmFactory: string }) => {
   const [form] = Form.useForm<FieldType>();
+  const [authMode, setAuthMode] =
+    useState<FieldType['auth_mode']>('access_key_secret');
 
   const { t } = useTranslate('setting');
   const options = useMemo(
@@ -33,13 +45,32 @@ const BedrockModal = ({
   const handleOk = async () => {
     const values = await form.validateFields();
 
+    // Only submit fields related to the active auth mode.
+    const cleanedValues: Record<string, any> = { ...values };
+
+    const fieldsByMode: Record<string, string[]> = {
+      access_key_secret: ['bedrock_ak', 'bedrock_sk'],
+      iam_role: ['aws_role_arn'],
+      assume_role: [],
+    };
+
+    cleanedValues.auth_mode = authMode;
+
+    Object.keys(fieldsByMode).forEach((mode) => {
+      if (mode !== authMode) {
+        fieldsByMode[mode].forEach((field) => {
+          delete cleanedValues[field];
+        });
+      }
+    });
+
     const data = {
-      ...values,
+      ...cleanedValues,
       llm_factory: llmFactory,
       max_tokens: values.max_tokens,
     };
 
-    onOk?.(data);
+    onOk?.(data as unknown as IAddLlmRequestBody);
   };
 
   return (
@@ -47,9 +78,6 @@ const BedrockModal = ({
       title={
         <div>
           <LLMHeader name={llmFactory} />
-          <Text type="secondary" style={{ display: 'block', marginTop: 4 }}>
-            {t('bedrockCredentialsHint')}
-          </Text>
         </div>
       }
       open={visible}
@@ -82,20 +110,75 @@ const BedrockModal = ({
         >
           <Input placeholder={t('bedrockModelNameMessage')} />
         </Form.Item>
-        <Form.Item<FieldType>
-          label={t('addBedrockEngineAK')}
-          name="bedrock_ak"
-          rules={[{ message: t('bedrockAKMessage') }]}
-        >
-          <Input placeholder={t('bedrockAKMessage')} />
-        </Form.Item>
-        <Form.Item<FieldType>
-          label={t('addBedrockSK')}
-          name="bedrock_sk"
-          rules={[{ message: t('bedrockSKMessage') }]}
-        >
-          <Input placeholder={t('bedrockSKMessage')} />
+
+        {/* AWS Credential Mode Switch (AK/SK section only) */}
+        <Form.Item>
+          <Segmented
+            block
+            value={authMode}
+            onChange={(v) => {
+              const next = v as FieldType['auth_mode'];
+              setAuthMode(next);
+              // Clear non-active fields so they won't be validated/submitted by accident.
+              if (next !== 'access_key_secret') {
+                form.setFieldsValue({ bedrock_ak: '', bedrock_sk: '' } as any);
+              }
+              if (next !== 'iam_role') {
+                form.setFieldsValue({ aws_role_arn: '' } as any);
+              }
+              if (next !== 'assume_role') {
+                form.setFieldsValue({ role_arn: '' } as any);
+              }
+            }}
+            options={[
+              {
+                label: t('awsAuthModeAccessKeySecret'),
+                value: 'access_key_secret',
+              },
+              { label: t('awsAuthModeIamRole'), value: 'iam_role' },
+              { label: t('awsAuthModeAssumeRole'), value: 'assume_role' },
+            ]}
+          />
         </Form.Item>
+
+        {authMode === 'access_key_secret' && (
+          <>
+            <Form.Item<FieldType>
+              label={t('awsAccessKeyId')}
+              name="bedrock_ak"
+              rules={[{ required: true, message: t('bedrockAKMessage') }]}
+            >
+              <Input placeholder={t('bedrockAKMessage')} />
+            </Form.Item>
+            <Form.Item<FieldType>
+              label={t('awsSecretAccessKey')}
+              name="bedrock_sk"
+              rules={[{ required: true, message: t('bedrockSKMessage') }]}
+            >
+              <Input placeholder={t('bedrockSKMessage')} />
+            </Form.Item>
+          </>
+        )}
+
+        {authMode === 'iam_role' && (
+          <Form.Item<FieldType>
+            label={t('awsRoleArn')}
+            name="aws_role_arn"
+            rules={[{ required: true, message: t('awsRoleArnMessage') }]}
+          >
+            <Input placeholder={t('awsRoleArnMessage')} />
+          </Form.Item>
+        )}
+
+        {authMode === 'assume_role' && (
+          <Form.Item
+            style={{ marginTop: -8, marginBottom: 16 }}
+            // keep layout consistent with other modes
+          >
+            <Text type="secondary">{t('awsAssumeRoleTip')}</Text>
+          </Form.Item>
+        )}
+
         <Form.Item<FieldType>
           label={t('bedrockRegion')}
           name="bedrock_region"