The Xiaomi MIX 4 is an Android smartphone launched on 10 August 2021 by Chinese company Xiaomi. As of 2021, it is the latest successor to the Xiaomi Mi MIX product line and follows its immediate predecessor the Xiaomi Mi MIX 3 which launched in 2018. The MIX 4 is the first device from Xiaomi to offer an under-display selfie camera, following the Axon 20 5G and Axon 30 from ZTE; Oppo also previewed the technology a week before the MIX 4's release.