Heidi Lynn Gardner (born July 27, 1983) is an American actress, comedian, and writer. She has been a cast member on the NBC sketch comedy series Saturday Night Live since season 43 in 2017, when she debuted as a featured player.

In 2014, Gardner joined the Sunday Company and a year later after a promotion to the Main Company, she quit her job as a hairstylist to focus on acting. During that time, she became a voice actress, regularly appearing on animated series incuding Bratz, SuperMansion, and Mike Tyson Mysteries. In 2017, she joined the cast of Saturday Night Live (SNL) along with Luke Null and Chris Redd for its forty-third season. After her first year on SNL, Gardner was hired to play Leonor in the Ben Falcone-directed film Life of the Party, alongside Melissa McCarthy, Falcone's wife. On August 28, 2019, TVLine reported that Gardner would have a guest role on the NBC comedy series Superstore, playing Dina Fox's nemesis Colleen who is transferred to Store 1217 after Cloud 9's Bel-Ridge location is shut down.