Selwyn Gwillym Blaylock (February 18, 1879 – November 19, 1945) was a part of starting the mining industry in western Canada. He was president of the Consolidated Mining & Smelting Co., a forebearer to Cominco and Teck Resources, recipient of several international awards for his work in metallurgy, and was the President of the Canadian Institute of Mining, Metallurgy and Petroleum in 1934–35. For his work he was inducted into the Canadian Mining Hall of Fame.
He was born in Paspébiac, Quebec. Blaylock attended Bishop's College School in Lennoxville, Quebec. In 1899, he obtained a B.Sc. from McGill University.
After graduating, he moved west and obtained work as a surveyor for the Canadian Smelting Works in Trail, British Columbia. Two years later, he became the company's chief chemist, but soon moved to Nelson, British Columbia to become general superintendent of the Hall Mines Smelter, then general superintendent of the St. Eugene mines. In 1908, Blaylock joined the Consolidated Mining and Smelting Company (Cominco). In 1919, he became Cominco's general manager. In 1922 a director, vice-president in 1927, managing director in 1938 and president in 1939.
Blaylock worked at the Cominco smelter until six months before he died in Trail in 1945. He was buried at Danville, Quebec.