Jamie Jilynn Chung (born April 10, 1983) is an American actress, blogger, and former reality television personality. She first gained fame in 2004 as a cast member on the MTV reality series The Real World: San Diego and subsequently through her appearances on its spin-off show, Real World/Road Rules Challenge: The Inferno II. She is regarded by many as the Real World alumna with the most successful media career.

She later transitioned into acting and has since become known for films, such as Dragonball Evolution, Grown Ups, Premium Rush, Sorority Row, The Hangover Part II, Sucker Punch, and Big Hero 6 and having been the series lead of the ABC Family television miniseries Samurai Girl. Chung received critical acclaim for her lead performance in the independent drama film about domestic human trafficking, Eden. In 2017, she was cast as the teleporting mutant Clarice Fong/Blink in the superhero drama series The Gifted on Fox.

Since 2012, Chung has appeared in the recurring role of Mulan in the ABC fantasy television series Once Upon a Time. She also created the fashion blog What the Chung?