New York State Route 11B (NY 11B) is a state highway in northern New York in the United States. It provides a parallel, more southerly east–west route to U.S. Route 11 between US 11 in Potsdam and US 11, NY 30, and NY 37 in Malone. NY 11B serves both the Potsdam Municipal Airport and the riverside hamlet of Nicholville, where NY 11B meets NY 458. Aside from the two villages at each end of the route and the hamlet of Nicholville near the midpoint, NY 11B passes through rural, lightly populated areas, as does its parent to the north. In Malone, NY 11B overlaps NY 30 for one block in order to reconnect to US 11.

U.S. Route 11 (US 11) is a part of the United States Numbered Highway System that runs from New Orleans, Louisiana, to the Canada–United States border at Rouses Point, New York. In the state of New York, US 11 extends for 318.66 miles (512.83 km) from the Pennsylvania state line south of the Southern Tier city of Binghamton to the Canada–United States border at the North Country village of Rouses Point, where it becomes Route 223 upon entering Quebec. The portion of US 11 south of Watertown follows a mostly north–south alignment and is paralleled by Interstate 81 (I-81) while the part of the route north of Watertown follows a more east–west routing, parallel to but not directly on the St. Lawrence River.