Cable One, Inc. (branded as Cable ONE) is a United States cable service provider and subsidiary of The Washington Post Company, functioning as its own self-contained corporation within its parent company. The company's name and current focus dates back to 1997; prior to that time the company was known as Post-Newsweek Cable. It is headquartered in Phoenix, Arizona.

Cable ONE is the 10th largest cable provider in the USA with most subscribers residing in small rural communities in nineteen midwestern, southern, and western states. As of January 2009, about 699,000 subscribers receive basic service and about 230,000 receive digital video service from Cable ONE. The company offers broadband Internet to over 370,000 subscribers. In May 2006, Cable ONE began a system-by-system launch of its digital telephone service with currently about 94,000 subscribers. Cable ONE is the only major cable provider that maps subchannel numbers same as digital cable box channel numbers.

Cable ONE currently provides service in 19 U.S. states including Alabama, Arizona, Arkansas, Idaho, Iowa, Kansas, Louisiana, Minnesota, Mississippi, Missouri, Nebraska, New Mexico, North Dakota, Oklahoma, Oregon, Tennessee, Texas, South Dakota, and Washington.

A cable is most often two or more wires running side by side and bonded, twisted or braided together to form a single assembly, but can also refer to a heavy strong rope. In mechanics cables, otherwise known as wire ropes, are used for lifting, hauling and towing or conveying force through tension. In electrical engineering cables are used to carry electric currents. An optical cable contains one or more optical fibers in a protective jacket that supports the fibers.

Electric cables discussed here are mainly meant for installation in buildings and industrial sites. For power transmission at distances greater than a few kilometres see high-voltage cable, power cables and HVDC.

Ropes made of multiple strands of natural fibers such as hemp, sisal, manila, and cotton have been used for millennia for hoisting and hauling. By the 19th century, deepening of mines and construction of large ships increased demand for stronger cables. Invention of improved steelmaking techniques made high-quality steel available at lower cost, and so wire ropes became common in mining and other industrial applications. By the middle of the 19th century, manufacture of large submarine telegraph cables was done using machines similar to those used for manufacture of mechanical cables.