Ashley Park

In 2009, Park made her professional theatre debut as Yvonne in Music Theatre Wichita's production of Miss Saigon. She spent the following two summers performing in Pittsburgh Civic Light Opera's Benedum Center production of Miss Saigon, with which she earned her Equity card.

Park made her Broadway debut as a member of the ensemble in Mamma Mia! at the Broadhurst Theatre on February 17, 2014. She left the production on September 21, 2014. From October 2014 to January 2015, Park portrayed Gabrielle in the original U.S. national touring company of Rodgers + Hammerstein's Cinderella.

Park returned to Broadway on April 16, 2015, in her first leading role as Tuptim in the 2015 revival of The King and I at the Vivian Beaumont Theater and remained with the production until its closing on June 26, 2016. Park was featured as a principal soloist on the cast recording for which she was nominated for a Grammy Award.

In February 2017, she appeared in the Broadway revival of Sunday in the Park with George as Celeste #1 and Theresa alongside Jake Gyllenhaal, Annaleigh Ashford, and Ruthie Ann Miles.

In the fall of 2017, Park portrayed MwE in the off-Broadway musical KPOP at the Ars Nova. She was nominated for a Drama Desk Award and a Drama League Award and also won a Lucille Lortel Award for this role. Park left the production in October 2017 due to her beginning rehearsals for the Mean Girls out-of-town tryout and was replaced by Marina Kondo.

Park starred as Gretchen Wieners in the Tony Award-nominated Broadway musical Mean Girls, written by Tina Fey with music and lyrics by Jeff Richmond and Nell Benjamin, respectively. The show had its world premiere as an out-of-town tryout at the National Theatre in Washington, D.C., from October 31, 2017, to December 3, 2017, in which Park originated the role of Gretchen Wieners. The musical, which is based on the film of the same name, began previews on March 12, 2018, and officially opened on Broadway on April 8, 2018, at the August Wilson Theatre in New York City. Park received nominations for numerous awards for her role as Gretchen Wieners, including nominations for the Tony Award for Best Featured Actress in a Musical, a Drama League Award, and the Drama Desk Award for Outstanding Featured Actress in a Musical. In May 2018 Park was awarded the Clarence Derwent Award, an honor "given to the most promising female and male performers" in New York City, by the Actors' Equity Foundation, along with Sean Carvajal. On March 10, 2019, Park left the production and was replaced by Krystina Alabado.

In June 2019, it was announced that Park would headline a "revamped" production of Thoroughly Modern Millie from May 6–10, 2020, for New York City Center Encores!. However, due to the COVID-19 pandemic, the production was cancelled, and ticket refunds were offered to the public.

Park was cast in August 2019 in the role of Mindy Chen in Netflix's Emily in Paris, opposite Lily Collins. The series premiered on October 2, 2020, and was renewed for a second season on November 11, 2020. Park's character covered "La Vie en Rose" in the first season of Emily in Paris. It was the most downloaded TV song for that week.

In October 2020 it was announced that Park would appear as Kaye Fields in As the Curtain Rises, an original podcast soap opera from the Broadway Podcast Network.

On December 28, 2020, it was announced that Park would star as Colette in a benefit concert presentation of Ratatouille the Musical, an internet meme that originated on TikTok, inspired by the 2007 Disney/Pixar film Ratatouille. The concert streamed on TodayTix on January 1, 2021.

In August 2021, it was announced Park would star as Cinderella in the 2022 Encores! version of Into the Woods. She was ultimately replaced by Denée Benton.

Park stars in Crazy Rich Asians writer Adele Lim's 2023 directorial debut, Joy Ride. The R-rated comedy "follows four Asian American women as they travel through Asia in search of one of their birth mothers."

In 2023, Park played Naomi in Netflix's dark comedy Beef and Kimber in the third season of Hulu's Only Murders in the Building.