Tendoy is an unincorporated community in Lemhi County, Idaho, United States, located at 44°57′34″N 113°38′41″W / 44.95944°N 113.64472°W on State Highway 28, at an altitude of 4,842 feet. It consists of a small general store and house. It was named for Tendoy, a prominent Lemhi Shoshone chief in the mid-19th century.