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The Utah–Idaho Intermountain League was an Independent baseball minor league baseball league that played in the 1900 season. As the name indicates, the four–team Utah–Idaho Intermountain League teams were based in Idaho and Utah. The Utah–Idaho Intermountain League played just the 1900 season before permanently folding.
On April 25, 1900, the Utah–Idaho Intermountain League officially began play, with the schedule continuing until September 19, 1900. The Ogden Lobsters won the 1900 Utah-Idaho Intermountain League Championship, ending the season with a 32–13 regular season record, finishing 4.5 games ahead of the 2nd place Rio Grande Rios (23–20). They were followed by the Pocatello Indians (21–24) and Short Line Shorts (12–23) in the final standings. There were no playoffs.
The Utah–Idaho Intermountain League permanently folded after the 1900 season ended on September 19, 1900. In 1901, the Ogden franchise and a Salt Lake City franchise joined two new clubs in another four–team league known similarly as the Inter-Mountain League.