键盘监听，又称键盘侧录，是指在使用键盘的人不知情的情况下，通过隐蔽的方式记录下键盘的每一次敲击的行为。进行键盘监听可通过各种软硬件手段实现。目前最常见的方法为在客户电脑上植入木马进程后通过其实现键盘监听。

Keystroke logging, often referred to as keylogging or keyboard capturing, is the action of recording (logging) the keys struck on a keyboard, typically covertly, so that the person using the keyboard is unaware that their actions are being monitored. Keylogging can also be used to study human–computer interaction. Numerous keylogging methods exist: they range from hardware and software-based approaches to acoustic analysis.