Pennsylvania Route 409 (designated by the Pennsylvania Department of Transportation as SR 409) is a 4.01-mile (6.45 km) long state highway located in Bradford County in Pennsylvania. The southern terminus is at U.S. Route 6 in Standing Stone Township. The northern terminus is at Route 706 in Camptown.

Route 409 begins at an intersection with U.S. Route 6 (the Grand Army of the Republic Highway) in the hamlet of Homets Ferry in Standing Stone Township. The route heads to the northeast, crossing an old alignment of Route 6 in the middle of fields before heading into the woodlands nearby, making a gradual curve out along a stagecoach road. The scenery changes from fields back to woodlands until Comiskey Road, where Route 409 turns eastward through fields and passes a lone residence. After intersecting with a dirt road, the highway enters a large patch of forestry, paralleling nearby Billings Creek Road before entering the hamlet of Camptown. In Camptown, Route 409 heads eastward through some residences before intersecting with Route 706 and Quadrant Route 1017 (Herrickville Road). This intersection is the northern terminus of Route 409.

The entire route is in Bradford County.