Randall Park made his acting debut in the 2003 short film Dragon of Love, which won the Best Short Film at the 2003 Hawaii International Film Festival.

He is best known for portraying Kim Jong-un in The Interview, starring alongside Dave Franco and Seth Rogen. He also starred as Louis Huang, patriarch of a Chinese American family, alongside Constance Wu, in ABC's television show Fresh Off The Boat (based on Eddie Huang's memoir, Fresh Off the Boat: A Memoir), written and produced by Nahnatchka Khan and executive produced by Jake Kasdan. He was the first actor cast on the show, with the producers having approached him before the pilot was ordered. For his performance, he was nominated for the Critics' Choice Television Award for Best Actor in a Comedy Series.

In 2019, he co-starred with comedian Ali Wong in Always Be My Maybe, a romantic comedy where two childhood sweethearts reconnect years later, even though they now both live completely different lives. He also appears in the Marvel Cinematic Universe as Agent Jimmy Woo in the 2018 film Ant-Man and the Wasp and 2021 miniseries WandaVision, and in the DC Extended Universe film Aquaman as Dr. Stephen Shin.

Park has made guest appearances on television shows including Curb Your Enthusiasm, New Girl, The Office, ER, CSI: Crime Scene Investigation, Four Kings, Las Vegas, House, iCarly, Cold Case, and Reno 911!. He appeared as Martin Fukanaga on Supah Ninjas and was a cast member on MTV's Wild 'n Out. In 2007, he regularly appeared as an actor in the filmmaking reality show On the Lot.

Park was a recurring character on The Mindy Project beginning in 2013. He was also on the HBO comedy Veep. He appeared as Jeff in the prequel 2015 series for Netflix, Wet Hot American Summer: First Day of Camp. In 2015 he also appeared in Wong Fu Productions' first feature film, Everything Before Us.

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