This article presents approaches to mitigate spatial interference in integrated MIMO receivers, avoiding irrecoverable signal distortion and relaxing the linearity and dynamic range requirements of the receiver chain and ADC under strong spatial blockers. Spatial interference mitigation techniques reviewed include analog multibeamforming matrices, feedforward spatial interference cancellation, and spatial notch filters (SNFs) that exploit bidirectional conversion. The autonomous blocker steering technique used to detect the angle of arrival (AoA) of spatial interference is also included. Metrics for evaluating the effectiveness of spatial interference mitigation are introduced. The article concludes with a performance summary of notable low and mid-band MIMO RX and mmWave MIMO RX demonstrations with spatial interference mitigation.