雅达利ST（英语：Atari ST）是一款家用与个人用电脑，在1985年至1990年代早期是非常成功的产品。依雅达利公司的正式说明，ST是英文「Sixteen/Thirty-two」（中文16/32之意），意指摩托罗拉68000处理器的外部16比特与内部32比特的总线。

雅达利ST的标准配备除了摩托罗拉68000处理器之外，还有512KB的内存以及3½英吋的软驱，另外还配有一个创新的单芯片绘图系统，使得它成为第一个具有彩色图形用户接口的电脑。

采用基于数字研究公司的GEMDOS所开发出来的Atari TOS(The Operating System)做为操作系统。

The Atari ST is a line of home computers from Atari Corporation and the successor to the Atari 8-bit family. The first ST model, the 520ST, was released in June 1985. "ST" officially stands for "Sixteen/Thirty-two", which referred to the Motorola 68000's 16-bit external bus and 32-bit internals. The Atari ST is the first personal computer to come with a bit-mapped color GUI, using a version of Digital Research's GEM released in February 1985. The 1040ST, released in 1986, is the first personal computer to ship with a megabyte of RAM in the base configuration and also the first with a cost-per-kilobyte of less than US$1.