The Gallatin Gateway Inn is a Spanish-stucco style railroad hotel at Gallatin Gateway, Montana. The hotel is one of the "Historic Inns of America." The Gallatin Gateway Inn was opened on June 18, 1927. Constructed and operated by The Milwaukee Road (Chicago, Milwaukee, St. Paul and Pacific Railroad), the luxury hotel was reached by electrified railroad branch line that connected to the Milwaukee's main line at Three Forks, Montana. It  offered travelers access to Yellowstone National Park. Park buses took passengers from the hotel to the park.
The hotel was originally built to promote tourism on the Milwaukee Road's Olympian and Columbian passenger trains. The hotel was restored in the 1980s. It was added to the National Register of Historic Places on January 24, 1980.

The Gallatin Gateway Inn ceased operations indefinitely in February, 2013