The Lincoln Tunnel is an approximately 1.5-mile-long (2.4 km) tunnel under the Hudson River, connecting Weehawken, New Jersey, to the west with Midtown Manhattan in New York City to the east. It carries New Jersey Route 495 on the New Jersey side and unsigned New York State Route 495 on the New York side. It was designed by Ole Singstad and named after Abraham Lincoln. The tunnel consists of three vehicular tubes of varying lengths, with two traffic lanes in each tube. The center tube contains reversible lanes, while the northern and southern tubes exclusively carry westbound and eastbound traffic, respectively.

The Lincoln Tunnel was originally proposed in the late 1920s and early 1930s as the Midtown Hudson Tunnel. The tubes of the Lincoln Tunnel were constructed in stages between 1934 and 1957. Construction of the central tube, which originally lacked sufficient funding due to the Great Depression, started in 1934 and it opened in 1937. The northern tube started construction in 1936, was delayed due to World War II-related material shortages, and opened in 1945. Although the original plans for the Lincoln Tunnel called for two tubes, a third tube to the south of the existing tunnels was planned in 1950 due to high traffic demand on the other two tubes. The third tube started construction in 1954, with the delay attributed to disputes over tunnel approaches, and opened in 1957. Since then, the Lincoln Tunnel has undergone a series of gradual improvements, including changes to security and tolling methods.

The Lincoln Tunnel is one of two automobile tunnels built under the Hudson River, the other being the Holland Tunnel between Jersey City, New Jersey and Lower Manhattan. The Lincoln Tunnel is also one of six tolled crossings in the New York area owned by the Port Authority of New York and New Jersey. The tolls on each crossing are only collected in the New York-bound direction. As of 2016, both directions of the tunnel carry a combined average of 112,995 vehicular crossings every day. The tunnel is part of New Jersey Route 495 on the western half of the river, and New York State Route 495 on the eastern half of the river. However, the New York state highway designation is not signed, and its use is inconsistent in official documents.