Lukas Hellum Lilleengen (born 15 November 2000) is a Norwegian professional tennis player. He has a career-high ATP singles ranking of No. 1,089 achieved on 29 August 2022 and a best doubles ranking of No. 364, reached on 27 October 2025.
Hellum Lilleengen represents Norway at the Davis Cup, where he has a W/L record of 1âÂÂ1.