John Herbert Carkin (November 18, 1883 – January 24, 1971) was an American politician, attorney, public service executive, and banker from the state of Oregon. He was a Republican who served nine years in the Oregon House of Representatives, where he represented a district in southern Oregon. He served as Speaker of the Oregon House of Representatives during the 1927 legislative session, elected by a unanimous vote of House members. Later, he served as chairman of the Oregon Tax Commission and was Oregon's Public Utility Commissioner before becoming president of a savings and loan association in Salem, Oregon.