  The third instalment of the VoxCeleb Speaker Recognition Challenge was held
in conjunction with Interspeech 2021. The aim of this challenge was to assess
how well current speaker recognition technology is able to diarise and
recognise speakers in unconstrained or `in the wild' data. The challenge
consisted of: (i) the provision of publicly available speaker recognition and
diarisation data from YouTube videos together with ground truth annotation and
standardised evaluation software; and (ii) a virtual public challenge and
workshop held at Interspeech 2021. This paper outlines the challenge, and
describes the baselines, methods and results. We conclude with a discussion on
the new multi-lingual focus of VoxSRC 2021, and on the progression of the
challenge since the previous two editions.
