diff --git a/app/auth.py b/app/auth.py
new file mode 100644
index 0000000..a8f88fe
--- /dev/null
+++ b/app/auth.py
@@ -0,0 +1,93 @@
+from typing import Any
+
+from fastapi import HTTPException, Request, status
+from passlib.context import CryptContext
+
+from app.db.database import get_connection
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+def hash_password(password: str) -> str:
+    return pwd_context.hash(password)
+
+
+def verify_password(plain_password: str, password_hash: str) -> bool:
+    if not password_hash:
+        return False
+
+    return pwd_context.verify(plain_password, password_hash)
+
+
+def get_user_by_username(username: str) -> dict[str, Any] | None:
+    con = get_connection()
+
+    row = con.execute(
+        """
+        SELECT id, username, display_name, email, password_hash, role, is_active, created_at, updated_at
+        FROM users
+        WHERE username = ?
+        """,
+        (username,),
+    ).fetchone()
+
+    con.close()
+    return dict(row) if row else None
+
+
+def get_user_by_id(user_id: int) -> dict[str, Any] | None:
+    con = get_connection()
+
+    row = con.execute(
+        """
+        SELECT id, username, display_name, email, password_hash, role, is_active, created_at, updated_at
+        FROM users
+        WHERE id = ?
+        """,
+        (user_id,),
+    ).fetchone()
+
+    con.close()
+    return dict(row) if row else None
+
+
+def authenticate_user(username: str, password: str) -> dict[str, Any] | None:
+    user = get_user_by_username(username.strip())
+
+    if not user or not user.get("is_active"):
+        return None
+
+    if not verify_password(password, user.get("password_hash") or ""):
+        return None
+
+    return user
+
+
+def current_user(request: Request) -> dict[str, Any] | None:
+    user_id = request.session.get("user_id")
+    if not user_id:
+        return None
+
+    try:
+        user_id = int(user_id)
+    except (TypeError, ValueError):
+        request.session.pop("user_id", None)
+        return None
+
+    user = get_user_by_id(user_id)
+    if not user or not user.get("is_active"):
+        request.session.pop("user_id", None)
+        return None
+
+    return user
+
+
+def require_user(request: Request) -> dict[str, Any]:
+    user = current_user(request)
+    if user:
+        return user
+
+    raise HTTPException(
+        status_code=status.HTTP_303_SEE_OTHER,
+        headers={"Location": "/portal/login"},
+    )
diff --git a/app/main.py b/app/main.py
index ad7a578..a36118d 100644
--- a/app/main.py
+++ b/app/main.py
@@ -2,17 +2,28 @@ from pathlib import Path
 
 from fastapi import FastAPI
 from fastapi.staticfiles import StaticFiles
+from starlette.middleware.sessions import SessionMiddleware
 
-from .routes import apps, backups, deployments, health
+from .config import read_env_value
+from .routes import apps, auth, backups, deployments, health
 
 
 def create_app() -> FastAPI:
     app = FastAPI(title="AppFactory Portal")
+    session_secret = read_env_value("PORTAL_SESSION_SECRET", "") or "dev-only-appfactory-session-secret"
+
+    app.add_middleware(
+        SessionMiddleware,
+        secret_key=session_secret,
+        same_site="lax",
+        https_only=False,
+    )
 
     static_dir = Path(__file__).parent / "static"
     app.mount("/static", StaticFiles(directory=static_dir), name="static")
 
     app.include_router(health.router)
+    app.include_router(auth.router)
     app.include_router(apps.router)
     app.include_router(backups.router)
     app.include_router(deployments.router)
@@ -20,4 +31,4 @@ def create_app() -> FastAPI:
     return app
 
 
-app = create_app()
\ No newline at end of file
+app = create_app()
diff --git a/app/routes/apps.py b/app/routes/apps.py
index 95e1dd3..e74eadd 100644
--- a/app/routes/apps.py
+++ b/app/routes/apps.py
@@ -1,8 +1,9 @@
 import html
 
-from fastapi import APIRouter, Form
+from fastapi import APIRouter, Depends, Form, Request
 from fastapi.responses import HTMLResponse
 
+from ..auth import require_user
 from ..config import (
     DEFAULT_APPFACTORY_HOST,
     DEFAULT_GITEA_ORG,
@@ -20,7 +21,7 @@ router = APIRouter()
 
 
 @router.get("/", response_class=HTMLResponse)
-def index():
+def index(request: Request, user=Depends(require_user)):
     apps = get_apps()
 
     gitea_url = read_env_value("GITEA_URL", "")
@@ -147,11 +148,12 @@ def index():
             </table>
         </div>
         """,
+        user=user,
     )
 
 
 @router.get("/new-app", response_class=HTMLResponse)
-def new_app_form():
+def new_app_form(request: Request, user=Depends(require_user)):
     return page(
         "Nová aplikace",
         """
@@ -183,11 +185,17 @@ def new_app_form():
             <p><a href="/portal">&larr; Zpět</a></p>
         </div>
         """,
+        user=user,
     )
 
 
 @router.post("/new-app", response_class=HTMLResponse)
-def create_app(app_id: str = Form(...), app_name: str = Form(...), template: str = Form(...)):
+def create_app(
+    app_id: str = Form(...),
+    app_name: str = Form(...),
+    template: str = Form(...),
+    user=Depends(require_user),
+):
     if template != "python-fastapi":
         return HTMLResponse("Nepodporovaná šablona", status_code=400)
 
@@ -207,11 +215,12 @@ def create_app(app_id: str = Form(...), app_name: str = Form(...), template: str
         ],
         extra_link=f"/apps/{html.escape(app_id)}/docs",
         extra_label="Otevřít Swagger",
+        user=user,
     )
 
 
 @router.post("/delete-app", response_class=HTMLResponse)
-def delete_app(app_id: str = Form(...)):
+def delete_app(app_id: str = Form(...), user=Depends(require_user)):
     result = run_command([DELETE_APP_SCRIPT, app_id])
     status = "OK" if result.returncode == 0 else "FAILED"
 
@@ -219,11 +228,17 @@ def delete_app(app_id: str = Form(...)):
         title=f"Smazání aplikace: {status}",
         back_url="/portal",
         sections=[("Výstup", result.stdout), ("Chyba", result.stderr)],
+        user=user,
     )
 
 
 @router.post("/update-resources", response_class=HTMLResponse)
-def update_resources(app_id: str = Form(...), memory: str = Form(""), cpus: str = Form("")):
+def update_resources(
+    app_id: str = Form(...),
+    memory: str = Form(""),
+    cpus: str = Form(""),
+    user=Depends(require_user),
+):
     memory = memory.strip()
     cpus = cpus.strip()
 
@@ -250,4 +265,5 @@ def update_resources(app_id: str = Form(...), memory: str = Form(""), cpus: str
             ("Výstup nasazení", deploy_result.stdout),
             ("Chyba nasazení", deploy_result.stderr),
         ],
+        user=user,
     )
diff --git a/app/routes/auth.py b/app/routes/auth.py
new file mode 100644
index 0000000..e695e60
--- /dev/null
+++ b/app/routes/auth.py
@@ -0,0 +1,67 @@
+import html
+
+from fastapi import APIRouter, Form, Request
+from fastapi.responses import HTMLResponse, RedirectResponse
+
+from app.auth import authenticate_user, current_user
+from app.templates.layout import page
+
+router = APIRouter()
+
+
+@router.get("/login", response_class=HTMLResponse)
+def login_form(request: Request):
+    if current_user(request):
+        return RedirectResponse(url="/portal", status_code=303)
+
+    return _render_login()
+
+
+@router.post("/login", response_class=HTMLResponse)
+def login(request: Request, username: str = Form(...), password: str = Form(...)):
+    user = authenticate_user(username, password)
+
+    if not user:
+        return _render_login("Neplatné přihlašovací údaje.")
+
+    request.session.clear()
+    request.session["user_id"] = user["id"]
+
+    return RedirectResponse(url="/portal", status_code=303)
+
+
+@router.post("/logout")
+def logout(request: Request):
+    request.session.clear()
+    return RedirectResponse(url="/portal/login", status_code=303)
+
+
+def _render_login(error: str | None = None) -> str:
+    error_html = ""
+    if error:
+        error_html = f'<p class="alert alert-danger">{html.escape(error)}</p>'
+
+    return page(
+        "Přihlášení",
+        f"""
+        <div class="auth-card card">
+            <h2>Přihlášení do portálu</h2>
+            <p class="muted">Přihlaste se interním účtem AppFactory.</p>
+            {error_html}
+
+            <form method="post" action="/portal/login">
+                <p>
+                    <label>Uživatelské jméno</label><br>
+                    <input name="username" autocomplete="username" required autofocus>
+                </p>
+
+                <p>
+                    <label>Heslo</label><br>
+                    <input type="password" name="password" autocomplete="current-password" required>
+                </p>
+
+                <button type="submit">Přihlásit</button>
+            </form>
+        </div>
+        """,
+    )
diff --git a/app/routes/backups.py b/app/routes/backups.py
index 5c19111..89b2f81 100644
--- a/app/routes/backups.py
+++ b/app/routes/backups.py
@@ -1,9 +1,10 @@
 import html
 from pathlib import Path
 
-from fastapi import APIRouter, Form
+from fastapi import APIRouter, Depends, Form, Request
 from fastapi.responses import HTMLResponse, RedirectResponse
 
+from ..auth import require_user
 from ..backups import is_backup_path, list_backups
 from ..config import BACKUP_SCRIPT
 from ..shell import run_command
@@ -13,7 +14,7 @@ router = APIRouter()
 
 
 @router.get("/backups", response_class=HTMLResponse)
-def backups_page():
+def backups_page(request: Request, user=Depends(require_user)):
     rows = ""
 
     for path in list_backups():
@@ -86,11 +87,12 @@ def backups_page():
             </table>
         </div>
         """,
+        user=user,
     )
 
 
 @router.post("/backups/create", response_class=HTMLResponse)
-def create_backup():
+def create_backup(user=Depends(require_user)):
     result = run_command([BACKUP_SCRIPT])
     status = "OK" if result.returncode == 0 else "FAILED"
 
@@ -98,11 +100,12 @@ def create_backup():
         title=f"Vytvoření zálohy: {status}",
         back_url="/portal/backups",
         sections=[("Výstup", result.stdout), ("Chyba", result.stderr)],
+        user=user,
     )
 
 
 @router.post("/backups/delete")
-def delete_backup(backup_path: str = Form(...)):
+def delete_backup(backup_path: str = Form(...), user=Depends(require_user)):
     target = Path(backup_path)
 
     if not is_backup_path(target):
diff --git a/app/routes/deployments.py b/app/routes/deployments.py
index c203ce2..c99c786 100644
--- a/app/routes/deployments.py
+++ b/app/routes/deployments.py
@@ -1,8 +1,9 @@
 import html
 
-from fastapi import APIRouter, HTTPException
+from fastapi import APIRouter, Depends, HTTPException, Request
 from fastapi.responses import HTMLResponse
 
+from app.auth import require_user
 from app.db.apps import get_deployment, get_deployments
 from app.templates.layout import page
 
@@ -26,7 +27,7 @@ def render_status_pill(status: str | None) -> str:
 
 
 @router.get("/deployments", response_class=HTMLResponse)
-async def deployments_page():
+async def deployments_page(request: Request, user=Depends(require_user)):
     deployments = get_deployments()
 
     rows = ""
@@ -85,12 +86,15 @@ async def deployments_page():
             </table>
         </div>
         """,
+        user=user,
     )
 
 
 @router.get("/deployments/{deployment_id}", response_class=HTMLResponse)
 async def deployment_detail_page(
     deployment_id: int,
+    request: Request,
+    user=Depends(require_user),
 ):
     deployment = get_deployment(deployment_id)
 
@@ -139,4 +143,5 @@ async def deployment_detail_page(
             <pre>{stderr}</pre>
         </div>
         """,
+        user=user,
     )
diff --git a/app/scripts/__init__.py b/app/scripts/__init__.py
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/app/scripts/__init__.py
@@ -0,0 +1 @@
+
diff --git a/app/scripts/set_admin_password.py b/app/scripts/set_admin_password.py
new file mode 100644
index 0000000..f563f74
--- /dev/null
+++ b/app/scripts/set_admin_password.py
@@ -0,0 +1,54 @@
+import sys
+
+from app.auth import hash_password
+from app.db.database import get_connection
+
+
+def main() -> int:
+    if len(sys.argv) != 2:
+        print("Použití: python -m app.scripts.set_admin_password <password>")
+        return 2
+
+    password_hash = hash_password(sys.argv[1])
+    con = get_connection()
+
+    row = con.execute("SELECT id FROM users WHERE username = ?", ("admin",)).fetchone()
+
+    if row:
+        con.execute(
+            """
+            UPDATE users
+            SET password_hash = ?,
+                is_active = 1,
+                updated_at = CURRENT_TIMESTAMP
+            WHERE username = ?
+            """,
+            (password_hash, "admin"),
+        )
+    else:
+        con.execute(
+            """
+            INSERT INTO users (
+                username,
+                display_name,
+                email,
+                password_hash,
+                role,
+                is_active,
+                created_at,
+                updated_at
+            )
+            VALUES (?, ?, ?, ?, ?, 1, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)
+            """,
+            ("admin", "Admin", "", password_hash, "admin"),
+        )
+
+    con.commit()
+    con.close()
+
+    print("Heslo administrátora bylo nastaveno.")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/app/static/styles.css b/app/static/styles.css
index 42e85c2..75982d4 100644
--- a/app/static/styles.css
+++ b/app/static/styles.css
@@ -39,6 +39,7 @@ header {
     display: flex;
     align-items: center;
     justify-content: space-between;
+    gap: 18px;
     border-bottom: 5px solid var(--primary);
     box-shadow: 0 10px 26px rgba(30, 81, 107, 0.16);
 }
@@ -75,6 +76,43 @@ nav a {
     border-radius: 8px;
 }
 
+.user-menu {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    color: white;
+    font-size: 13px;
+    font-weight: 700;
+}
+
+.user-menu .muted {
+    color: rgba(255, 255, 255, 0.72);
+}
+
+.user-menu form {
+    margin: 0;
+}
+
+.auth-card {
+    max-width: 420px;
+    margin: 48px auto 24px;
+}
+
+.auth-card input {
+    width: 100%;
+}
+
+.alert {
+    border-radius: 8px;
+    padding: 10px 12px;
+    font-weight: 700;
+}
+
+.alert-danger {
+    background: var(--danger-bg);
+    color: var(--danger);
+}
+
 main {
     padding: 32px;
     max-width: 1500px;
diff --git a/app/templates/layout.py b/app/templates/layout.py
index 1030483..169f76d 100644
--- a/app/templates/layout.py
+++ b/app/templates/layout.py
@@ -3,7 +3,31 @@ import html
 from ..config import PORTAL_PREFIX
 
 
-def page(title: str, body: str) -> str:
+def page(title: str, body: str, user=None) -> str:
+    nav = ""
+    user_panel = ""
+
+    if user:
+        username = html.escape(user.get("username", ""))
+        display_name = html.escape(user.get("display_name") or user.get("username", ""))
+        nav = """
+            <nav>
+                <a href="/portal">Aplikace</a>
+                <a href="/portal/new-app">Nová aplikace</a>
+                <a href="/portal/deployments">Nasazení</a>
+                <a href="/portal/backups">Zálohy</a>
+            </nav>
+        """
+        user_panel = f"""
+            <div class="user-menu">
+                <span>{display_name}</span>
+                <span class="muted">@{username}</span>
+                <form method="post" action="/portal/logout">
+                    <button type="submit" class="btn-secondary">Odhlásit</button>
+                </form>
+            </div>
+        """
+
     return f"""
     <html>
     <head>
@@ -17,12 +41,8 @@ def page(title: str, body: str) -> str:
                 <img src="{PORTAL_PREFIX}/static/csbot-logo.svg" alt="CSBOT">
                 <span>AppFactory</span>
             </a>
-            <nav>
-                <a href="/portal">Aplikace</a>
-                <a href="/portal/new-app">Nová aplikace</a>
-                <a href="/portal/deployments">Nasazení</a>
-                <a href="/portal/backups">Zálohy</a>
-            </nav>
+            {nav}
+            {user_panel}
         </header>
         <main>
             {body}
@@ -32,7 +52,7 @@ def page(title: str, body: str) -> str:
     """
 
 
-def render_result(title, back_url, sections, extra_link=None, extra_label=None):
+def render_result(title, back_url, sections, extra_link=None, extra_label=None, user=None):
     rendered_sections = ""
 
     for section_title, content in sections:
@@ -57,4 +77,5 @@ def render_result(title, back_url, sections, extra_link=None, extra_label=None):
             {rendered_sections}
         </div>
         """,
+        user=user,
     )
diff --git a/requirements.txt b/requirements.txt
index 11ffa9a..df82d57 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,7 @@
 fastapi
 uvicorn[standard]
 python-multipart
-jinja2
\ No newline at end of file
+jinja2
+passlib[bcrypt]
+bcrypt<4.1
+itsdangerous