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 1–1.

ITF World Tennis Tour finals

Doubles: 5 (2 titles, 3 runner-ups) LegendITF WTT (2–3)Finals by surfaceHard (1–2)Clay (1–1)

ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss0–1M15 Oslo, NorwayWTTHard (i) Jakob Grøner Yannik Steinegger Jakub Paul4–6, 1–6Win1–1M25 Värnamo, SwedenWTTClay Viktor Durasovic Henrik Bladelius Filip Gustafsson7–5, 6–3Loss1–2M25 Roehampton, UKWTTHard Viktor Durasovic Joshua Charlton Harry Wendelken6–3, 6–7(1–7), [9–11]Win2–2M25 Glasgow, UKWTTHard (i) Viktor Durasovic Alexis Canter Marcus Walters6–7(5–7), 6–2, [10–4]Loss2–3M25 Uriage-les-Bains, FranceWTTClay Max Westphal Lenny Couturier Timeo Trufelli3–6, 6–3, [8–10]

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