NatCo stands for National Company and describes a subsidiary of a multinational corporation. Often used in connection with telephone companies (so called TelCos).
NATCO is also an abbreviation used by a number of very different organisations:
National Tea Company, a midwestern US grocery chain NATCO Group, provides equipment for separating water from crude oil Northern Areas Transport Corporation, runs buses in Pakistan-controlled Kashmir
Natco may also refer to: Natco, New Jersey Natco Pharma, an Indian pharmaceutical company