Denis Boileau is a French voice actor who has been active in the dubbing industry since at least the 1970s, with a birth year recorded as 1950. While he has extensive credits in French dubbing for live-action films and television series, he has also performed voice work for numerous animated productions, including both Western animation and Japanese anime.

Boileau's filmography in animation includes a variety of character roles. In the anime and animated feature category, he provided the French voice for Seki in the Netflix animated series Blue Eye Samurai. He also voiced the Grand Vénérable in the 2007 animated film Doctor Strange - The Sorcerer Supreme. His work extends to other well-known animated franchises; he voiced Reilly in Les Rebelles de la forêt 3 (Open Season 3) and Bepo in Les Pingouins à la rescousse. Boileau lent his voice to the character Julius in both Niko, le petit renne (2008) and its sequel Niko, le petit renne 2 (2012). Additional roles include Le chasseur in L'Ours Montagne and the character Darwin in Clochette et le secret des fées (Secret of the Wings).

Boileau has been part of several major Western animated franchises. He voiced the character Bernie Kropp in the French dub of Pixar's Les Indestructibles (The Incredibles). In the world of Star Wars, he provided the voice for Jedi Master Yoda in the fifth and sixth seasons of Star Wars - The Clone Wars. He also voiced Lord Redbrick in Gnomeo et Juliette and its sequel Sherlock Gnomes, as well as the Sheriff of Nottingham in Tom et Jerry: L'histoire de Robin des Bois (Tom and Jerry: Robin Hood and His Merry Mouse). His television animation credits include the role of le Professeur Péricles (Professor Pericles) in Scooby-Doo! Mystères Associés (Scooby-Doo! Mystery Incorporated).

In addition to his animation voice roles, Boileau has an extensive career dubbing live-action performances. He has been the regular French voice for actors such as Michael Caine and Nathan Lane, and has dubbed Richard Schiff, John Billingsley, and John Larroquette in various films and television series. His live-action dubbing work includes providing the French voice for Richard Tozier in the television adaptation of Stephen King's It.

Over the course of his career, Boileau has collaborated frequently with several other French voice actors. He has worked most often with actress Valerie Siclay, with whom he has shared at least four productions. He has also worked on at least three titles each with Fily Keita, Bernard Alane, Philippe Catoire, Marie Zidi, Hervé Grull, and Emmanuel Rausenberger, among others.