is a city in Cache County, Utah, United States. The population was 7,261 at the 2000 census. It is included in the Logan, Utah-Idaho (partial) Metropolitan Statistical Area.
According to the United States Census Bureau, the city has a total area of 4.3 square miles (11.2 km²), all of it land.
Originally known as Summit Creek, Smithfield was founded in 1857 by Robert Thornley and his cousin Seth Langdon who were sent north from Salt Lake City by Brigham Young to found a settlement on Summit Creek. After a preeliminary scouting, Robert returned with his new wife Annie Brighton. The first winter was spent in a wagon box. By the next summer, with more settlers arriving, a small fort was built on the edge of the creek, one cabin of which remains. As the settlement grew, a Bishop was named and the town took his name. By 1917 the town had planted trees on both sides of its Main Street and had acquired a Carnegie Library and a Rotary Club. Dependent for many years on dairying, a DelMonte canning factory, and the sugar beet industry, the town is now essentially a bedroom community for Logan and its Utah State University. Smithfield is home to Sunrise and Summit elementary schools, and Sky View, a county high school.