Martynas Sajus (born 22 February 1996) is a Lithuanian professional basketball player for ONVO Büyükçekmece of the Basketbol Süper Ligi (BSL).

On 9 July 2014, Sajus signed a five-year (3+2) contract with Žalgiris Kaunas and started to play for the club's reserve team in the NKL.

In December 2015, because of injuries in the Žalgiris main team, he was registered for a LKL match against BC Dzūkija and made a debut by scoring 2 points.

On July 3, 2018, Sajus parted ways with the team and signed with Wilki Morskie Szczecin of the Polish PLK.

[5] On June 6, 2020, Sajus joined Baxi Manresa of the Liga ACB on a one-year deal.