Lothaire Bluteau (born 14 April 1957) is a Canadian actor. He was born in Montreal, Quebec and performs in both French and English. Lothaire Bluteau has worked in theatre, film and television throughout Canada and internationally. He abandoned medicine for the theatre and was first noticed for his performance as a mentally challenged youth in Yves Simoneau's Les Fous de bassan. After receiving great acclaim for the lead in the stage version of Being at Home with Claude, he won a best actor Genie Award for his performance in Denys Arcand's Oscar-nominated Jésus de Montréal. He has since appeared in Black Robe and Robert Lepage's Le Confessionnal, and his international credits include Orlando (1992) and I Shot Andy Warhol (1996).

He had a recurring role in the third season of the television series 24 as the character Marcus Alvers. In the fourth season of The Tudors, he played Charles de Marillac, the French ambassador to the court of King Henry VIII. In July 2014, it was announced he was cast in the History Channel series Vikings as the 9th century King of France, Charles the Bald.