Pennsylvania Route 903 (PA 903) is a 17.7-mile (28.5 km) long state highway located in Carbon and Monroe counties in Pennsylvania. The southern terminus is at US 209 in Jim Thorpe. The northern terminus is at PA 115 in Tunkhannock Township.

PA 903 begins at an intersection with US 209 in Jim Thorpe, Carbon County, heading northeast on two-lane undivided River Street. The road immediately comes to a bridge over a Reading Blue Mountain and Northern Railroad line, the Lehigh River, and a Norfolk Southern railroad line. After this, the route turns north and heads into residential areas, heading north-northwest onto West Front Street before turning northeast onto North Street. PA 903 continues past more homes with some businesses before turning east into forested areas as an unnamed road. The road heads into Penn Forest Township, running northeast through more forests with some residences and agricultural clearings. The route heads through forested areas with some wooded residential subdivisions, running through Christmans and passing over I-476 (Northeast Extension of the Pennsylvania Turnpike). A planned E-ZPass-only interchange with I-476 will be built here with a scheduled completion date for 2013. PA 903 heads through more dense forests, passing through a portion of Hickory Run State Park before passing to the west of the residential development of Towamensing Trails. The road crosses into Kidder Township and intersects PA 534.

The route heads north at this point and passes through a mix of woods and fields with some development before continuing back into dense forests and turning northeast near the Big Boulder ski resort and Big Boulder Lake. PA 903 enters Tunkhannock Township in Monroe County and continues to its northern terminus at PA 115.