Stephen Anthony Hartgen (September 30, 1944 – December 31, 2021) was an American politician who was a member of the Idaho House of Representatives, serving from 2008 to 2018.

[citation needed] In July 2008, after the death of Senator Tom Gannon, the Legislative District 23 Republican Central Committee met to fill the vacancy in the Idaho Senate seat and replace Gannon's name on the upcoming general election ballot.

[4] The committee met again to fill the vacancy in the Idaho House of Representatives from Brackett's appointment to the Senate and replace Brackett's name for representative on the upcoming general election ballot.

The committee selected Hartgen to replace Brackett's name on the ballot for Representative and sent three names in order of preference to Otter to fill the vacancy: Hartgen, former Representative Gene Winchester, of Homedale, and Doran Parkins, of Marsing.

[5] Otter appointed Hartgen to serve the remainder of Brackett's term in the House.