New Jersey State Highway 29 is a state highway in New Jersey, United States. It runs from an intersection with Interstate 295 in Hamilton Township, New Jersey (where it continues as Interstate 195) to Bridge Street/Race Street in Frenchtown, New Jersey. (See Interstate 95.)

In Lambertville, New Jersey, officially, both directions of NJ 29 run down South Main Street. Nevertheless, South Main Street is one-way southbound for a bit. So, the northbound traffic empties onto secret New Jersey State Highway 165, which goes north to the point where traffic can once again go northbound on NJ 29; the signs there say "TO NJ 29".