Cable One, Inc. (branded as Cable ONE) is an American cable service provider and former subsidiary of Graham Holdings 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 7th largest cable provider in the US, serving more than 800,000 customers in 21 states with high speed Internet, cable television, and telephone service. Cable One offers wireless internet service, high-definition programming, and phone service with free local calling, and free unlimited long distance calling in the continental U.S.

Cable One offers cable television service in two tiers:

Cable One offers internet service in three tiers:

Cable one is rolling out Giga one fiber optic internet throughout its service region and they offer one plan:

Cable One offers home phone service in two tiers:

Business services available through Cable One include high speed internet with speeds from 15 to 500Mbit/s; business phone service with free long distance calling plans within the continental U.S.; and cable television services.

– Still in operation, but no longer offers cable or Internet as part of its services