智能天线(Smart antenna)，又名可变天线阵列、多天线，有时也会被称作MIMO，指的是带有可以判定信号的空间消息（比如传播方向）和跟踪、定位信号源的智能算法，并且可以根据此消息，进行空域滤波的天线阵列。

智能天线技术在许多领域内都有应用，包括声音处理、跟踪扫描雷达、射电天文学、射电望远镜和3G手机网络。

Smart antennas (also known as adaptive array antennas, multiple antennas and, recently, MIMO) are antenna arrays with smart signal processing algorithms used to identify spatial signal signature such as the direction of arrival (DOA) of the signal, and use it to calculate beamforming vectors, to track and locate the antenna beam on the mobile/target. Smart antennas should not be confused with reconfigurable antennas, which have similar capabilities but are single element antennas and not antenna arrays.