Marcin Janusz (born 31 July 1994) is a Polish professional volleyball player who plays as a setter for ZAKSA Kędzierzyn-Koźle and the Poland national team.

[1][2][3] Janusz is a silver medallist at the 2024 Summer Olympics and the 2022 World Championship, as well as a two–time Champions League winner (2022, 2023) with ZAKSA.

On 7 February 2016, alongside PGE Skra, he won the Polish Cup after beating ZAKSA in the final.

In April 2016, he was a member of the same team which won a bronze medal in the 2015–16 PlusLiga season.

On 10 August 2024, he won the silver medal at the 2024 Summer Olympic Games in Paris.