Sandhog is the slang term given to urban miners and construction workers who work underground on a variety of excavation projects in New York City, and later other cities. Generally these projects involve tunneling, caisson excavation, road building, or some other type of underground construction or mining projects. The miners work with a variety of tools including using tunnel boring machines and explosives to remove material for the project they are building. The term sandhog is an American colloquialism.

Starting with their first job in 1872, the Brooklyn Bridge, the "hogs" have built a large part of the New York City infrastructure including the subway tunnels and sewers, Water Tunnels No. 1 and No. 2 as well as the currently under construction Water Tunnel No. 3, the Lincoln, Holland, Queens-Midtown, and Brooklyn-Battery tunnels. In addition, they worked on the foundations for most of the bridges and many of the skyscrapers in the city. Traditionally, these workers have been Irish or Irish American. Some West Indians are now sandhogs. Sandhogging is often a tradition and is passed down through generations of families; since mining projects span decades, it is not uncommon for multi-generations of families to work together on the same job. Warren Beatty was a rare exception in the 1950s, as a recently-arrived to New York individual, who worked as a Sandhog relatively briefly on the third tube of the Lincoln Tunnel.