智能手机（smartphone），指具有独立的移动操作系统，可透过安装应用软件、游戏等进程来扩充手机功能，运算能力及功能均优于传统功能手机的一类手机。

最初的智能手机功能并不多，后来的机型增加了便携式媒体播放器、低端「傻瓜式」数码相机和闪光灯（手电筒）、袖珍摄像机和GPS导航、NFC、重力感应水平仪等功能，使其成为了一种功能多样化的设备。很多智能手机还拥有高分辨率触摸屏和网页浏览器，从而可以显示标准网页以及移动优化网页。通过Wi-Fi和移动宽带，智能手机还能实现高速数据访问，云端访问等。近年来，行动应用程序市场及移动商务、手机游戏产业、社交即时通信网络的高速发展。

A smartphone is a mobile phone with an advanced mobile operating system which combines features of a personal computer operating system with other features useful for mobile or handheld use. It typically combines the features of a cell phone with those of other popular mobile devices, such as personal digital assistant (PDA), media player, GPS navigation unit and digital camera. Most smartphones can access the Internet and can run third-party apps. They have a touchscreen user interface, with LCD, OLED, AMOLED, LED or similar screen. Smartphones became widespread in the 21st century and most of those produced from 2012 onwards have high-speed mobile broadband 4G LTE, motion sensors, and mobile payment.