Aliksei Uladzimiravich Mzhachyk (Belarusian: Аляксей Уладзіміравіч Мжачык; 30 June 1996 – 1 August 2021) was a Belarusian weightlifter.

He placed 12th in the men's +105 kg event at the 2016 Summer Olympics held in Rio de Janeiro, Brazil.

[1][2] In age-specific categories he won the bronze medal at the 2017 European Junior & U23 Weightlifting Championships.

Mzhachyk died in a car accident in Germany on 1 August 2021.

This biographical article relating to weightlifting in Belarus is a stub.