Lukas Hellum Lilleengen (born 15 November 2000) is a Norwegian tennis player.

Hellum Lilleengen has a career-high ATP singles ranking of No.

He also has a career-high doubles ranking of No.

[2] Hellum Lilleengen represents Norway at the Davis Cup, where he has a W/L record of 1–1.

This biographical article relating to Norwegian tennis is a stub.