仿真航管组织，VATSIM（Virtual Air Traffic Simulation Network）是一个非牟利组织，于互联网上营运的全球性网络，为各种配有仿真飞行软件或仿真雷达软件的电脑提供一个连系的平台，从而给予用家一个仿真真实的飞行环境。在VATSIM的网络上，无论是机师还是空中交通管制员，除了需要遵守VATSIM的规定外，也要跟随真实的天气、民航规定、飞行进程、航道、航图等来使用VATSIM的服务，以达致最接近现实世界的飞行环境。

VATSIM, or Virtual Air Traffic Simulation Network, is a non-profit organization operating a dedicated, worldwide, Internet-based flight-simulation network. Users can connect to the network to either fly online as a pilot using flight simulation software, or direct traffic as an air traffic controller (ATC) and participate in what has been described as a close approximation of real-life aviation procedures. The organization has achieved notability for its very high level of participation and realism, that has seen it in use as part of Federal Aviation Administration funded research projects. This notability resulted in the organization being featured on the front page of The Wall Street Journal in 2006. It is considered the largest online flight simulation network in the world with over 209,000 registered members as of September 3, 2009, with hundreds of participants online at any one time.