Maks Kaśnikowski (born 6 July 2003) is a Polish tennis player.

At the 2024 Oeiras Indoors, he reached his second Challenger final, saving six match points in the opening round against Adrian Andreev, and then defeating two Portuguese players, wildcard João Domingues, second seed João Sousa and Valentin Royer.

Only a 19-year-old Jerzy Janowicz was younger when he won his title in St. Remy, France in 2010.

He became the third Polish champion in the history of the tournament, joining Jerzy Janowicz (2012) and Hubert Hurkacz (2018).

193, he made his Grand Slam debut, after qualifying for the main draw at the US Open but lost to Pedro Martínez.