Utah Territorial Statehouse, Historic governmental building in Fillmore, United States.

The Utah Territorial Statehouse is a two-story red sandstone building located in Fillmore that now operates as a museum. Inside, multiple rooms contain exhibitions and historical artifacts documenting the early development of the territory.

In 1851 Brigham Young and lawmakers chose Fillmore as capital of the provisional State of Deseret for its central location; when Congress created Utah Territory instead, Fillmore became its territorial capital. Construction ran from 1852 to 1855, but only the south wing of a planned four-wing building with a central Moorish dome was finished after federal funding ran out. The legislature met there for one full session and parts of two others before the seat of government returned to Salt Lake City in 1856.

The Assembly Hall on the second floor holds the piano, podium and chairs used by the territorial legislature, with maps of the Utah Territory's size. The Governor's Office was chosen by Brigham Young for its morning and afternoon sunlight. After the Civil War the building housed a Presbyterian mission school, and its Teachers Room is kept as it looked then.

The museum is open on most weekdays and allows visitors to walk through the rooms at their own pace. Plan to spend enough time exploring all the exhibitions across both floors and the basement level.

The stonemasons who built the structure carved their initials into the exterior walls, expecting plaster to cover them later. These marks remain visible today, creating an unexpected link to the craftsmen who worked there over 160 years ago.