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is a city in Canyon County, Idaho, United States. The population was 2,978 at the 2000 census. It is part of the Boise City–Nampa, Idaho Metropolitan Statistical Area.
Middleton is the oldest settlement in Canyon County, with the land being parceled out in 1863 by William N. Montgomery. A flour mill built in 1871 brought prosperity to the town. The Boise River flooded in 1872 and cut a new channel, isolating the town on an island; as a result, the town moved to a new location in the years after 1880. The town incorporated as a city in 1910 (although the certificate wasn't issued until 1971.) The present mayor is (as of late 2006): Frank McKeever. On February 1, 2007, 70% of Middleton High School burned down, caused by the overheating of a fan above the weight room. The 42-year old building was not equipped with sprinklers to prevent the fire.