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In this paper, we propose two relay antenna selection (RAS) schemes in multiple-input-multiple-output (MIMO) two-way relay networks, where an N _A -antenna source and an N _B -antenna source exchange information via an N _R -antenna amplify-and-forward (AF) relay. The proposed RAS schemes maximize the minimum of the two overall end-to-end signal-to-noise ratio (SNR) values. In the first RAS scheme, transmit and receive beamforming (BF) is adopted at the two sources using all antennas. In the second RAS scheme, transmit and receive antenna selection (AS) is adopted at the two sources using one antenna. To conduct a performance comparison of the proposed RAS-BF and RAS-AS schemes, we first derive new expressions for the exact outage probability over independent but not necessarily identically distributed Nakagami-m fading channels. We then derive new closed-form lower and upper …