Greenleaf is a city in Canyon County, Idaho, United States. The population was 846 at the 2010 census. Greenleaf is part of the Boise-Nampa metropolitan area. The town was established by Quakers in the early-1900s and is named after Quaker poet and abolitionist John Greenleaf Whittier.

Canyon County is located in the U.S. state of Idaho. As of the 2020 Census, the population was 231,105, which by 2022 was estimated to have risen to 251,065. making it the second-most populous county in Idaho. The county seat is Caldwell, and its largest city is Nampa. Canyon County is part of the Boise metropolitan area.