Route 156 is a 1.18-mile (1.90 km) long state highway in New Jersey, United States. It is a short connector in Yardville-Groveville, New Jersey, which is part of Hamilton Township, Mercer County. It is an old two-lane alignment of U.S. Route 130 that was bypassed by a new multi-lane highway a short distance to the east in the 1950s, and designated just before the 1953 renumbering. The route interchanges with Route 130 at both termini, carrying local traffic to Yardville, a portion of Hamilton Township. The route has remained mainly intact since 1953.

Route 156 begins at an interchange with U.S. Route 130 in Hamilton Township. The route for a short distance passes a factory before heading to the northeast into the community of Yardville. In Yardville, the route parallels Route 130 and several residential homes before intersecting with Church Street in the southern end of the community. After Church Street, the surroundings around Route 156 lessen, until an intersection with Broad Street, where it picks up again. A short distance after, Route 156 intersects with County Route 524 (Yardville-Allentown Road), which runs as the main thoroughfare in Yardville. After County Route 524, the highway continues to the northeast along the Route 130 parallel before the route merges back in with the southbound lanes, which is the designated northern terminus.

Route 156 was originally an alignment of State Highway Route 25 (co-designated U.S. Route 130) in the 1927 renumbering through Yardville. The route was realigned on a bypass around 1952, a year before the 1953 renumbering, in which Route 25 was decommissioned. Route 130 ran on a four-lane bypass to the east, while the alignment in Yardville became Route 156. The route has remained virtually intact since then.

The entire route is in Hamilton Township, Mercer County.