在微软的Windows NT系列操作系统中，Winlogon 是负责处理安全相关的用户交互界面的组件。Winlogon的工作包括加载其他用户身份安全组件、提供图形化的登录界面，以及创建用户会话。这个模块是Windows操作系统的关键进程，其中止会造成Windows崩溃。

Winlogon负责在登录时调用用户身份安全组件搜集用户身份凭据，在Windows Vista之前的NT版本Windows中，这个界面由图形化识别和验证（GINA）模块提供。Windows默认的实现msgina.dll根据系统的快速用户切换设置显示一个用户列表或者一个用户名/密码输入框。但是其他开发者也可以提供GINA模块使得用户可以用指纹、智能卡或者面部识别等其他方式登录系统。在Vista及之后的版本的系统中，由于旧的GINA架构造成在安装了有缺陷的GINA时系统不稳定，微软使用LogonUI和凭据提供者替代GINA作为用户身份凭据的插件接口。

In computing, Winlogon is the component of Microsoft Windows operating systems that is responsible for handling the secure attention sequence, loading the user profile on logon, and optionally locking the computer when a screensaver is running (requiring another authentication step). The actual obtainment and verification of user credentials is left to other components. Winlogon is a common target for several threats that could modify its function and memory usage. Increased memory usage for this process might indicate that it has been "hijacked". In Windows Vista and later operating systems, Winlogon's roles and responsibilities have changed significantly.