Thomas John Rattigan (born 20 July 1937 in Boston) is an American businessman.
Rattigan earned a BS at Boston College in 1960 and an MBA at Harvard Business School in 1962. He joined PepsiCo in 1970 where he rose to the position of CEO of PepsiCo International in 1982.
In 1986 Rattigan took over as CEO from Marshall F. Smith. He continued the downsizing his predecessor had initiated, cut unprofitable product lines and initiated the development of two more models of Commodore's flagship Amiga 1000 computer.
Despite turning the company from a US$237 million three-quarter loss to a $22 million profit in one quarter, Rattigan was fired by major shareholder Irving Gould, who temporarily took over as CEO. Rattigan sued Commodore for $9 million of lost income, due to the breach of contract. 
In 1991 Rattigan was appointed by the court as CEO of G. Heileman Brewing Co. He steered the company through bankruptcy and left in 1994, pocketing almost $20 million in severance pay. "You can't say he did a terrible job with Heileman. But he certainly didn't turn it around", PaineWebber analyst Goldman told the Wall Street Journal in 1996. 
- Jeremy Reimer (2008-02-11). "A history of the Amiga, part 6: stopping the bleeding". Ars Technica. Retrieved 2016-02-16.
- Christine Winter (1987-04-24). "SURPRISE COMMODORE SHAKEUP". Chicago Tribune. Retrieved 2020-06-14.
- Susan Pulliam (1996-11-19). "Some Analysts Question Icahn's Choice for RJR". The Wall Street Journal. Retrieved 2016-02-16.
- Glen Collins (1997-02-28). "Icahn Ends RJR Nabisco Proxy Fight". The New York Times. Retrieved 2016-02-16.