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A scow is a smaller type of barge. Some scows are rigged as sailing scows. In the 19th and early 20th centuries, scows carried cargo in coastal waters and inland waterways, having an advantage for navigating shallow water or small harbours. Scows were in common use in the American Great Lakes and other parts of the U.S., Canada, southern England, and New Zealand. In modern times their main purpose is for recreation and racing.

Sailing scows have significant advantages over traditional deep-keel sailing vessels that were common at the time the sailing scow was popular. Keelboats, while stable and capable in open water, were incapable of sailing into shallow bays and rivers, which meant that to ship cargo on a keelboat required a suitable harbour and docking facilities, or else the cargo had to be loaded and unloaded with smaller boats. Flat-bottomed scows, on the other hand, could navigate shallow waters, and could even be beached for loading and unloading. This made them useful for moving cargo from inland regions unreachable by keelboat to deeper waters where keelboats could reach. The cost of this shallow water advantage was the loss of the seaworthiness of flat-bottomed scow boats in open water and bad weather.

The squared-off shape and simple lines of a scow make it a popular choice for simple home-built boats made from plywood. Phil Bolger and Jim Michalak, for example, have designed a number of small sailing scows, and the PD Racer and the John Spencer designed Firebug are growing classes of home-built sailing scow. Generally these designs are created to minimize waste when using standard 4-foot by 8-foot sheets of plywood.

The scow hull is also the basis for the shantyboat or, on the Chesapeake, the ark, a cabin houseboat once common on American rivers. The ark was used as portable housing by Chesapeake watermen, who followed, for example, shad runs seasonally.

The Thames sailing barge and the Norfolk wherry are two British equivalents to the scow schooner. The Thames sailing barges, while used for similar tasks, used significantly different hull shapes and rigging.

The term scow is used in and around the west Solent for a traditional class of sailing dinghy. Various towns and villages claim their own variants (Lymington, Keyhaven, Yarmouth, West Wight, Chichester), they are all around 11 feet (3.35 m) in length and share a lug sail, pivoting centre board, small foredeck and a square transom with a transom-hung rudder.