Iowa Highway 85 (Iowa 85) is a short state highway in east-central Iowa. The route begins at the eastern city limit of Montezuma and ends at Iowa 21 east of Deep River. Created in 1920 as a spur route connecting What Cheer to Primary Road No. 2, it is an original route in the Iowa primary highway system. In the early 1930s, the route was extended north to Deep River and west to Montezuma. By the end of the decade, Iowa 21 had taken over the north–south portion of the route. Except for both endpoints shifting slightly, Iowa 85 has largely stayed the same since the 1930s.