Justin Howell is a Canadian-American stunt performer and actor originally from Mississauga, Ontario. Standing at approximately 6′3″ (1.92 m), he has been active in film and television since around 2013. Based in Toronto, he holds dual Canadian and U.S. citizenship and is bilingual in English.

He built his early career performing stunts and serving as a stunt double in numerous well-known genre productions. His credits include roles as a stunt performer in TV series like Arrow, Supergirl, Titans, The Punisher, and Batwoman, as well as utility stunt work in blockbuster films such as Avengers: Infinity War and Avengers: Endgame. In 2016, he doubled for Joel Kinnaman in Suicide Squad, and in 2019 took on stunts and doubling work in Shazam!. His résumé also includes high-profile projects such as Dark Phoenix, Bloodshot, Nightmare Alley, Nobody, Fahrenheit 451, and My Spy.

Howell's rising prominence as a stunt double continued through major franchise work. He doubled for Chris Hemsworth in Thor: Love and Thunder (2022) and Extraction 2 (2023) and portrayed the stunt double for Master Chief on the series Halo (2022–2024). In 2024, he played a minor acting role as Gio, alongside doubling duties in Extraction 2, and performed stunts in The Man from Toronto, The Killer, and 40 Acres. Moreover, Howell was tapped as the lead stunt double for David Corenswet in James Gunn's Superman.

Off-screen, Howell is married to fellow performer Aurélia Agel; the couple remain active members of the stunt community in Hollywood and Canada, frequently working together and earning attention such as a joint feature in Red Bull's The Red Bulletin.