BACnet是用于智能建筑的通信协定，是国际标准化组织（ISO）、美国国家标准协会（ANSI）及美国采暖、制冷与空调工程师学会（ASHRAE）定义的通信协定。BACnet针对智能建筑及控制系统的应用所设计的通信，可用在暖通空调系统（HVAC，包括暖气、通风、空气调节）也可以用在照明控制、门禁系统、火警侦测系统及其相关的设备。优点在于能降低维护系统所需成本并且安装比一般工业通信协定更为简易，而且提供有五种业界常用的标准协定，此可防止设备供应商及系统业者的垄断，也因此未来系统扩充性与兼容性大为增加。

BACnet is a communications protocol for building automation and control networks. It is an ASHRAE, ANSI, and ISO 16484-5 standard protocol.

BACnet was designed to allow communication of building automation and control systems for applications such as heating, ventilating, and air-conditioning control (HVAC), lighting control, access control, and fire detection systems and their associated equipment. The BACnet protocol provides mechanisms for computerized building automation devices to exchange information, regardless of the particular building service they perform.