2013–2016: early roles and breakthrough |left|190x190px Tremblay began acting in television roles. He made his film debut in
The Smurfs 2, released in 2013. Tremblay portrayed Jack Newsome in the critically acclaimed drama film
Room, co-starring with
Brie Larson. The film, directed by
Lenny Abrahamson, premiered on September 4, 2015, at the
Telluride Film Festival, and was released in cinemas on October 16, 2015. For his performance, he was nominated for the 2015
Screen Actors Guild Award for Outstanding Performance by a Male Actor in a Supporting Role, becoming the youngest actor nominated for that award and the second-youngest in all categories. In 2016, Tremblay played a supporting role in the comedy film ''
Donald Trump's The Art of the Deal: The Movie''; and guest-starred as the younger version of the main character, Phil Miller, on
Fox's post-apocalyptic comedy series
The Last Man on Earth. That same year, he starred in the horror film
Before I Wake, with
Kate Bosworth and
Thomas Jane, and played a supporting role in the psychological thriller
Shut In, alongside
Naomi Watts, and co-starring
Oliver Platt, and directed by
Farren Blackburn. He also portrayed Wes Firth in the adventure comedy-drama
Burn Your Maps, starring with
Vera Farmiga and
Marton Csokas.
2017–present: dramas and animation roles In 2017, Tremblay played Peter Carpenter in director
Colin Trevorrow's drama film
The Book of Henry, co-starring with Naomi Watts and
Maddie Ziegler. He also starred as August Pullman, a child with
Treacher Collins syndrome, in
Wonder, based on R.J. Palacio's
novel of the same name. The latter film proved to be his most successful, earning over $285 million against a $20 million budget. In 2019, Tremblay made his comedy debut by headlining the R-rated comedy
Good Boys co-starring with
Brady Noon and Keith L. Williams.
Good Boys earned $21 million during its opening weekend, becoming the first R-rated comedy since
The Boss, which was released in April 2016, to finish first at the box office. Tremblay brought his fellow actors to tears with his cameo performance in
Doctor Sleep, the 2019 sequel to
The Shining, as a kidnapped boy who is tortured to death in a scene which director
Mike Flanagan initially feared would be too traumatic to include in the final cut. Commenting on the performance, Flanagan said, "he's one of the best actors I’ve ever worked with in my entire life." In July 2019, it was announced that he would be voicing
Flounder in the
live-action adaptation of Disney's
The Little Mermaid, directed by
Rob Marshall. Tremblay voices
Robin in the
DC Universe adult animation series
Harley Quinn. Tremblay provided the voice of the
titular character in the
Pixar film
Luca, released in 2021. He also voiced roles in the films ''
My Father's Dragon (2022), The Little Mermaid (2023), in which he portrays Flounder, and Orion and the Dark (2024) as the titular character. In 2025, Tremblay starred opposite Nick Offerman in the crime thriller film Sovereign, which earned him acclaim and a nomination for the Independent Spirit Award for Best Supporting Performance. He will next star in the dark animated fantasy Wildwood, the horror film The Night House, and will portray the "Unabomber" Ted Kaczynski in the biographical crime film Unabom''. ==Personal life==