State Route 103 (SR 103) is a secondary state highway in Dyer County, Tennessee, USA. It runs from the Mississippi River east to State Route 78 in Bogota, Tennessee. This highway crosses State Route 181 and passes through the small communities of Miston, Tennessee and Tennemo, Tennessee. The first 1.6 miles (2.6 km) of this highway are gravel and is subject to flooding from the Mississippi River, this section is unsigned in the field but maintained by TDOT as SR 103.