Pennsylvania Route 903 is a 17.7-mile-long (28.5 km) state highway located in Carbon and Monroe counties in Pennsylvania. The southern terminus is at U.S. Route 209 in Jim Thorpe. The northern terminus is at PA 115 in Tunkhannock Township. The route runs through rural areas of the Pocono Mountains, with an interchange with the Pennsylvania Turnpike Northeast Extension in Penn Forest Township and a junction with PA 534 in Kidder Township. PA 903 is a two-lane undivided road nearly its entire length, besides the I-476 intersection. The route was designated in 1928 between US 209/US 309 in present-day Jim Thorpe, and a connecting road, now PA 115, south of Blakeslee. The highway was fully paved in the 1930s. Between 2008 and 2015, an E-ZPass-only interchange was constructed with I-476.

Carbon County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 64,749. The county is part of the Northeast Pennsylvania region of the state.