The film hits theaters March 8, 2019.
Marvel Studios confirmed the news at the annual Comic-Con confab in San Diego, where Larson received a standing ovation in Hall H.
Variety exclusively reported in June that the breakout star of “Room” was in talks for the role.
Captain Marvel, aka Carol Danvers, is one of Marvel’s most popular female superheroes.
There is currently no director attached to the film.
“Inside Out” scribe Meg LeFauve and Nicole Perlman are currently writing the script, which follows Carol Danvers, an air force pilot whose DNA is fused with that of an alien during an accident. The resulting alteration imbues her with the super powers of strength, energy project and flight.
Kevin Feige will produce the film.
Larson, repped by WME and Authentic Talent and Literary Management, was also in San Diego promoting her other major film, “King Kong: Skull Island,” which opens next year.