The Idaho Republican Party (IDGOP) is the Idaho state affiliate of the United States Republican Party, headquartered in Boise. It is currently the dominant party in the state, controlling both of Idaho's U.S. House seats, both U.S. Senate seats, the governorship, and has supermajorities in both houses of the state legislature.

The Idaho Legislature consists of the upper Idaho Senate and the lower Idaho House of Representatives. Idaho is divided into 35 legislative districts, which each elect one senator and two representatives. There are no term limits for either chamber.