Highway 345 (AR 345, Ark. 345, and Hwy. 345) is a designation for two north–south state highways in Baxter County, Arkansas. A western segment of the route runs 3.36 miles (5.41 km) between U.S. Route 62 Business (US 62 Bus.) in Cotter and US 62/US 412 in Gassville. An eastern segment runs 0.63 miles (1.01 km) from US 62 to AR 126 in Gassville.