InterNorth Inc. was a large energy company headquartered at the Northern Natural Gas Building in Omaha, Nebraska, in the United States, specializing in natural gas pipelines but also a force in the plastics industry, coal and petroleum exploration and production.

In March 1980, Northern Natural Gas reorganized as a holding company, InterNorth.

[4] Although intended to secure InterNorth's independence, the HNG takeover proved a "wag-the-dog" transaction: despite an initial plan for dual headquarters in Omaha and Houston, with InterNorth CEO Samuel Segnar in control, the company soon was based entirely in Houston and run by HNG's CEO, Ken Lay.

Initially, Lay and his secretary were on board with design consultancy Lippincott & Margulies’s pitched name, Enteron, due to the positive connotations of the words "enter" and "on', though it was soon discovered to be a medical term for the intestines.

Dynegy then sold Northern to Warren Buffett's Berkshire Hathaway who moved it back to Omaha.