Rigby is a small city in and the county seat of Jefferson County, Idaho, United States. The population was 2,998 at the 2000 census.
The larger "Rigby area" includes such outlying unincorporated communities as Annis, Garfield, Grant, Labelle, and Clark. Other nearby incorporated areas within Jefferson County include Menan, Roberts, Lewisville, and Ririe.
Rigby is part of the Idaho Falls, Idaho Metropolitan Statistical Area, and is located directly between the two larger Idaho cities of Rexburg and Idaho Falls, providing its residents with a wide variety of shopping, entertainment and cultural choices. Many Rigby citizens commute to jobs in Rexburg or Idaho Falls, and a number of residents work for the federal government or federal contractors through the Idaho National Laboratory (INL), locally called "The Site".