Android（读音：英：['ændrɔɪd]，美：[ˈænˌdrɔɪd]），中文俗称安卓或安致，是一个基于Linux核心的开放行动操作系统，由Google成立的Open Handset Alliance（OHA，开放手机联盟）持续领导与开发，主要设计用于触摸屏幕行动设备如智能型手机和平板电脑。

Android最初由安迪·鲁宾（Andy Rubin）等人开发制作，最初开发这个系统的目的是创建一个数字相机的先进操作系统；但是后来发现市场需求不够大，加上智能型手机市场快速成长，于是Android被改造为一款面向智能型手机的操作系统。于2005年7月11日被美国科技企业Google收购 。2007年11月，Google与84家硬件制造商、软件开发商及电信营运商成立开放手机联盟来共同研发改良Android，随后，Google以Apache免费开放源代码许可证的授权方式，发布了Android的源代码，让生产商推出搭载Android的智能型手机，Android后来更逐渐拓展到平板电脑及其他领域上。

Android is a mobile operating system (OS) currently developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. Android's user interface is mainly based on direct manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input. In addition to touchscreen devices, Google has further developed Android TV for televisions, Android Auto for cars, and Android Wear for wrist watches, each with a specialized user interface. Variants of Android are also used on notebooks, game consoles, digital cameras, and other electronics.