Ken Buck Republican Greg Lopez Republican The 2024 Colorado's 4th congressional district special election was held on June 25, 2024, to fill the vacant seat in Colorado's 4th congressional district.

The seat became vacant on March 22, 2024, when Ken Buck resigned from Congress.

[1] The 4th district is based in eastern Colorado and the exurbs of Denver, taking in Highlands Ranch, Loveland, and Castle Rock.

The Republican nominee was chosen on March 28, 2024, by a 111-member committee.

Two candidates in the election, Holtorf and Lynch, served on the committee.