The 1904 Wyoming gubernatorial election was held on November 8, 1904. Shortly after he began his second term in 1903, Governor DeForest Richards died in office, elevating Secretary of State Fenimore Chatterton to the Governorship and triggering a special election in 1904 to fill the balance of Richards's term. Chatterton ran for re-election, but was defeated for renomination at the Republican convention by Bryant B. Brooks. Former Congressman John E. Osborne, the former Territorial Governor, was nominated by the Democratic Party. Aided by President Theodore Roosevelt's landslide victory over Democrat Alton B. Parker in the presidential election, Brooks overwhelmingly defeated Osborne.

Bryant Butler Brooks was an American businessman, rancher, politician, oilman, banker and published author. He was the seventh governor of Wyoming from January 2, 1905, until January 2, 1911.