| Classification | Class D (1911–1914) |
|---|---|
| Sport | Minor League Baseball |
| First season | 1911 |
| Ceased | 1914 |
| President | William Henry Lucas (1911–1912) Van Patte (1912) E. C. Mulroney (1913) Edward F. Murphy (1914) |
| No. of teams | 8 |
| Country | United States of America |
| Most titles | 2 Great Falls Electrics (1911, 1913) |
The Union Association was a Class D level Minor league baseball circuit that operated from 1911 through 1914, with franchises based in Idaho, Montana and Utah. It was unrelated to the like-named 1884 major league.