BeOS是一种由Be公司针对多媒体使用所开发的操作系统。

1991年，让-路易·加西带领包括AppleNewton开发员Steve Sakoman在内的一众Apple员工创建了Be公司。Be公司开发了一个全新的操作系统，从设计之初就针对多CPU和多线程的应用进程。与此同时，Apple已陷入不能推出其新操作系统Copland的困境，正在寻找代替品。加西认为这是个黄金时机。1996年，加西要价4亿美金，允许Apple Computer使用BeOS。然而Apple估算Be公司的总值为8000万美金，故此出价1.2亿，后来上升到2亿。最终未能成交，Apple转而购买NeXTSTEP，同时重新得到史蒂夫·乔布斯。

BeOS is an operating system for personal computers first developed by Be Inc. in 1991. It was first written to run on BeBox hardware. BeOS was built for digital media work and was written to take advantage of modern hardware facilities such as symmetric multiprocessing by utilizing modular I/O bandwidth, pervasive multithreading, preemptive multitasking and a 64-bit journaling file system known as BFS. The BeOS GUI was developed on the principles of clarity and a clean, uncluttered design.