Tómas Lemarquis (born August 3, 1977) is a French-Icelandic actor.

Lemarquis was born in Reykjavík to an Icelandic mother and a French father, Gérard Lemarquis, a schoolteacher. His most noticeable physical feature — the complete absence of hair of any kind — is the result of alopecia universalis, because of which he had become completely bald by the age of 14. He grew up between Iceland and France and studied dramatic art at the Cours Florent in Paris, where he studied alongside actress Audrey Tautou. He also attended the Reykjavík School of Fine Arts in Iceland.

Lemarquis is perhaps best known for his leading role in the 2003 Icelandic film Noi the Albino. Lemarquis played the lead role in the 2018 Berlin Film Festival winner Touch Me Not. He has also appeared in such films as Snowpiercer, X-Men: Apocalypse, and Blade Runner 2049.