State Road 103 in the U.S. State of Indiana is a 14-mile (23 km) north–south route in Henry County.

State Road 103 nearly parallels its parent route, State Road 3, between U.S. Route 36 east of Mount Summit and U.S. Route 40 in Lewisville.

It runs through downtown New Castle and past the Wilbur Wright Fish and Wildlife Area.

It also crosses Interstate 70, but there is no interchange.

The entire route is in Henry County.