Who is Brie Larson? Chances are you barely knew her name last year, but now she’s an Oscar-nominated actress.

And not in the supporting category, either. For her performance in “Room,” Larson is competing against leading actresses like Cate Blanchett (“Carol”), Jennifer Lawrence (“Joy”), Saoirse Ronan (“Brooklyn) and Charlotte Rampling (“45 Years”).

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What’s more, Larson appears to be leading the Oscar race. She has already picked up awards from various critics groups, the National Board of Review, the Screen Actors Guild and the Golden Globes.

Not bad for someone whose last film role was a bit part in “Trainwreck.” (Larson played Amy Schumer’s levelheaded sister.) Before that she appeared briefly in the Mark Wahlberg vehicle “The Gambler” and played Miles Teller’s ex-girlfriend in “The Spectacular Now.”

Back in 2013, Larson played Grace, a counselor for troubled teens, in “Short Term 12,” a critically acclaimed drama that many expected would make her a star.

It looks like “Room” has become her real career springboard. Larson plays a woman who has been imprisoned — and impregnated by — a psychopath. When her son (Jacob Tremblay) turns 5, she hatches a daring plan to escape. Variety called Larson “superb,” and London’s Guardian called her “nothing short of perfect.”