Samuel Kňažko (born 7 August 2002) is a Slovak professional ice hockey defenceman who is currently playing for the Cleveland Monsters in the American Hockey League (AHL) as a prospect to the Columbus Blue Jackets of the National Hockey League (NHL).

Kňažko was selected 78th overall by the Blue Jackets in the 2020 NHL Entry Draft.

[1] After his selection by the Blue Jackets, Kňažko was signed to a three-year, entry-level contract with Blue Jackets on June 9, 2021.

[2] Kňažko served as Slovakia's captain in the 2021 and 2022 editions of the IIHF World Junior Championship.

[3] He was selected to make his full IIHF international debut, participating for Slovakia in the 2021 IIHF World Championship.