Byron James Seaman (September 7, 1923 – April 24, 2021) was a Canadian businessman. He was the co-owner of the Calgary Flames of the National Hockey League (NHL) for three decades from 1980 until 2010.
Seaman was born in Rouleau, Saskatchewan, on September 7, 1923. He was one of four children of Byron Luther Seaman and Mae Patton, who were both born and raised in the United States. He attended the University of Saskatchewan and earned a Bachelor of Science degree in mechanical engineering in 1945.
Seaman moved to Alberta shortly after graduating to work in the oil industry with his two brothers, Donald and Daryl Seaman. They first established Seaman Engineering and Drilling Co. Ltd. (shortened to Sedco). It became noted for providing the option of turnkey contracts at a fixed price, rather than bidding a price for every foot drilled. The company also covered a portion of the drilling costs to secure the contract, as well as for services like cementing and casing. Sedco ultimately merged with three other companies in June 1962 to form Bow Valley Industries. Seaman went on to serve as CEO of Bow Valley (later Bovar, Inc) from 1976 to 1987, and as chairman from 1987 to 1990.