Acting career
In 2018, his sophomore year of high school, Feldman portrayed Frank Abagnale Jr. in his high school's production of the musical Catch Me If You Can. After winning his regional awards program for this performance, he was invited to perform at the Jimmy Awards, where he won the award for best actor. Stacey Mindich, the lead producer of Dear Evan Hansen, saw his performance and asked him to audition for the role of Evan Hansen on Broadway. On January 30, 2019, at the age of 16, Feldman assumed the role of Evan Hansen, taking over for Taylor Trensch. His performance was lauded, with Sarah Bahr in the New York Times writing, "Andrew Barth Feldman made me forget where I was, who I was, that I was anything other than part of the world onstage...I'm pretty sure I didn't draw breath the entire first act." He left the show on January 26, 2020, after which Jordan Fisher took over the role.
During the pandemic he began a fundraiser for the Actor's Fund called "Broadway Jackbox" in March 2020, alongside former Dear Evan Hansen co-star Alex Boniello. This fundraiser streamed on Twitch with famous Broadway and screen actors each week. He additionally created a murder mystery series called Broadway Whodunit, starring Broadway and theatre actors. During his run in the show, he kept a Broadway.com vlog. He also maintains a YouTube channel under his name. He started his theatre company, Zneefrock Productions, to raise money for autism awareness. He can be heard playing himself in As the Curtain Rises, an original Broadway soap opera podcast from the Broadway Podcast Network.
Feldman starred as Alfredo Linguini in a benefit concert presentation of Ratatouille the Musical, an internet meme that originated on TikTok, inspired by the 2007 Disney/Pixar film. The concert streamed exclusively on TodayTix on January 1, 2021. His performance was celebrated, with Jesse Green writing in The New York Times that Feldman "seems to have animated his face to match Pixar's version: He's instantly adorable while looking like he still might gnaw your toe."
Feldman made his television acting debut in the Disney+ show High School Musical: The Musical: The Series as a recurring guest star in season 2 playing Antoine, a French exchange student.
On May 7, 2021, Feldman appeared in the short film Thespians by Casey Likes, a 2019 Jimmy Award finalist.
Feldman made his feature-film acting debut in April 2023 in Netflix's A Tourist's Guide to Love as Alex, a college-bound vlogger. He starred opposite Jennifer Lawrence in No Hard Feelings in June 2023 as Percy Becker, a soon-to-be college student who is also socially clueless.
He then played Neil Levy in the 2024 SNL biopic Saturday Night and voiced both Dopey and the narrator in Disney's 2025 live-action remake of Snow White.
Feldman starred as Oliver in Maybe Happy Ending opposite his offstage girlfriend, Helen J. Shen, for a nine-week engagement from September 2 to November 1, 2025. Asian theatre artists expressed disappointment over the casting of Feldman, a non-Asian actor, in a show set in Korea and in a role originated on Broadway by an actor of partly Asian descent, noting that Asian actors are underrepresented on American stages.