diff --git a/src/main/bootstrap.ts b/src/main/bootstrap.ts
index 0d9f4e7..7f78a67 100644
--- a/src/main/bootstrap.ts
+++ b/src/main/bootstrap.ts
@@ -263,6 +263,8 @@ function notifyRenderer(channel: string, data?: Record<string, unknown>): void {
 
 async function initLLMPolling(): Promise<void> {
   const llm = getLocalLLMService()
+  // 설치되어 있는데 꺼져 있으면 자동 실행 (detached). 폴링이 준비 완료를 감지한다.
+  await llm.ensureRunning()
   llm.startPolling()
 }
 
diff --git a/src/main/services/LocalLLMService.ts b/src/main/services/LocalLLMService.ts
index 5f307d5..58cdb3d 100644
--- a/src/main/services/LocalLLMService.ts
+++ b/src/main/services/LocalLLMService.ts
@@ -3,6 +3,9 @@
 // 설계서 01의 ILocalLLMService 구현.
 
 import { EventEmitter } from 'events'
+import { spawn } from 'child_process'
+import * as fs from 'fs'
+import * as path from 'path'
 import { getLogger } from './LoggerService'
 import { configGet } from './ConfigService'
 import { D3ROError, ErrorCode } from '@shared/errors'
@@ -101,6 +104,120 @@ class LocalLLMService extends EventEmitter {
     return this._state
   }
 
+  /**
+   * Ollama 서버가 실행 중인지 확인하고, 설치되어 있는데 실행 중이 아니면 자동 실행한다.
+   *
+   * 반환값:
+   * - 'running': 이미 실행 중
+   * - 'starting': 바이너리를 찾아 detached 스폰 완료 (준비 확인은 폴링이 담당)
+   * - 'not-installed': Ollama 바이너리를 찾을 수 없음
+   * - 'failed': 스폰 시도 실패
+   */
+  async ensureRunning(): Promise<'running' | 'starting' | 'not-installed' | 'failed'> {
+    if (await this._ping(1500)) {
+      logger.info('Ollama server already running')
+      return 'running'
+    }
+
+    const binaryPath = await this._findOllamaBinary()
+    if (!binaryPath) {
+      logger.warn('Ollama binary not found — install from https://ollama.com')
+      return 'not-installed'
+    }
+
+    logger.info(`Ollama not running, auto-starting from ${binaryPath}`)
+
+    try {
+      const child = spawn(binaryPath, ['serve'], {
+        detached: true,
+        stdio: 'ignore',
+        windowsHide: true
+      })
+      child.unref()
+      logger.info('Ollama serve spawned (detached) — polling will detect readiness')
+      return 'starting'
+    } catch (error) {
+      logger.error(
+        `Failed to spawn ollama serve: ${error instanceof Error ? error.message : String(error)}`
+      )
+      return 'failed'
+    }
+  }
+
+  /**
+   * Ollama /api/tags 엔드포인트로 가용성 핑. 지정 타임아웃 내 응답이 오면 true.
+   */
+  private async _ping(timeoutMs: number): Promise<boolean> {
+    const serverUrl = configGet('ollamaServerUrl')
+    try {
+      const response = await fetch(`${serverUrl}/api/tags`, {
+        signal: AbortSignal.timeout(timeoutMs)
+      })
+      return response.ok
+    } catch {
+      return false
+    }
+  }
+
+  /**
+   * 플랫폼별 기본 설치 경로 + PATH 탐색으로 ollama 바이너리 위치를 찾는다.
+   */
+  private async _findOllamaBinary(): Promise<string | null> {
+    const candidates: string[] = []
+
+    if (process.platform === 'win32') {
+      const localAppData = process.env.LOCALAPPDATA
+      if (localAppData) {
+        candidates.push(path.join(localAppData, 'Programs', 'Ollama', 'ollama.exe'))
+      }
+      const programFiles = process.env['ProgramFiles']
+      if (programFiles) {
+        candidates.push(path.join(programFiles, 'Ollama', 'ollama.exe'))
+      }
+    } else if (process.platform === 'darwin') {
+      candidates.push('/usr/local/bin/ollama', '/opt/homebrew/bin/ollama')
+    } else {
+      candidates.push('/usr/local/bin/ollama', '/usr/bin/ollama')
+    }
+
+    for (const candidate of candidates) {
+      try {
+        await fs.promises.access(candidate, fs.constants.X_OK)
+        return candidate
+      } catch {
+        // 다음 후보 시도
+      }
+    }
+
+    return await this._whichOllama()
+  }
+
+  /**
+   * `where ollama` (win) / `which ollama` (mac/linux)로 PATH에서 바이너리를 찾는다.
+   */
+  private _whichOllama(): Promise<string | null> {
+    return new Promise((resolve) => {
+      const cmd = process.platform === 'win32' ? 'where' : 'which'
+      const proc = spawn(cmd, ['ollama'], {
+        stdio: ['ignore', 'pipe', 'ignore'],
+        windowsHide: true
+      })
+      let out = ''
+      proc.stdout.on('data', (chunk: Buffer) => {
+        out += chunk.toString()
+      })
+      proc.on('close', (code) => {
+        if (code === 0) {
+          const firstLine = out.split(/\r?\n/).find((line) => line.trim().length > 0)
+          resolve(firstLine ? firstLine.trim() : null)
+        } else {
+          resolve(null)
+        }
+      })
+      proc.on('error', () => resolve(null))
+    })
+  }
+
   /**
    * Ollama 가용성 폴링을 시작한다 (5초 간격).
    */