Armacost is a surname. It is a variant of the Americanized German surname Armagost. Notable people with the surname include:
Audrey Mika Armacost (born 2000), American singer and songwriter Austin Armacost (born 1988), American TV personality and model Michael Armacost (1937–2025), American diplomat Samuel Armacost (born 1940), American businessman, former CEO of BankAmerica Corporation Wilbur H. Armacost (1893–1971), American mechanical engineer
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