Diane E. Mitsch Bush[1] (born February 17, 1950)[2] is an American politician and retired sociology professor who served as a member of the Colorado House of Representatives.

[5] She then served as a member of the Colorado House of Representatives for the 26th district from January 9, 2013, to November 2, 2017, after which she resigned to focus on her campaign for Congress.

[9] In 2016, Mitsch Bush co-sponsored and voted to require state contractors to comply with federal equal pay standards.

[12] In July 2017, Mitsch Bush announced her candidacy for the congressional seat held by Scott Tipton, and won the Democratic nomination in June 2018.

She faced Lauren Boebert, a restaurant owner from Rifle, Colorado, who defeated Tipton in the Republican primary.