Heidi Montag Pratt (born September 15, 1986) is an American television personality. Montag is known for appearing on the MTV reality series The Hills.

Born in Crested Butte, Colorado, Montag moved to California after graduating high school where she enrolled at the Academy of Art University in San Francisco. During freshman orientation, she met Lauren Conrad who was then a featured cast member on the MTV reality series Laguna Beach: The Real Orange County. After Montag and Conrad transferred to Fashion Institute of Design & Merchandising in Los Angeles, Conrad received her own spin-off series The Hills, which premiered on May 31, 2006. Montag was featured in the series sharing an apartment with Conrad while studying at the Fashion Institute of Design & Merchandising. She eventually left the Fashion Institute in fall of 2005 when she was hired at Bolthouse Productions. According to Montag, she dropped out because she "did not find the school challenging." Within two years, she was promoted to event planner at Bolthouse, before being fired and then re-hired.

Montag appeared in every episode of seasons one and two of The Hills, and appeared in season three, which aired on MTV on August 13, 2007. In the summer of 2006, Montag began dating fellow Hills cast member Spencer Pratt, a former manager of Brody Jenner. Season 2 of The Hills (which aired from January through April 2007) focused on Montag's relationship with Pratt and its effect on her friendships with Conrad and fellow Hills cast member Audrina Patridge. On the Season 2 finale, Montag moved out of her apartment with Conrad to live with Pratt. Although Conrad maintained the two were still friends after Montag moved out, the friendship soon ended when Conrad blamed Montag and Pratt for spreading rumors about a sex tape featuring her and ex-boyfriend Jason Wahler. In October 2008, the pair reportedly ended their feud.