Charles Oscar Finley (February 22, 1918–February 19, 1996), nicknamed Charlie O or Charley O, was an American businessman who is best remembered for his tenure as the owner of the Oakland Athletics Major League Baseball team. Finley purchased the franchise while it was located in Kansas City, moving it to Oakland in 1968. He is buried in Merrillville, Indiana's Calumet Park Cemetery.

Finley purchased the Oakland Seals of the National Hockey League in 1970, renaming the team California Golden Seals. Mimicking the A's, he changed the team colors to green and gold and had the Seals wear white skates instead of the traditional black skates, a move deeply unpopular with both players and fans. During his tenure, the Seals traded a first-round draft pick that turned into future Hall of Famer Guy Lafleur. He also allowed five of his best players to bolt to the upstart World Hockey Association. Finley ultimately lost interest in the team, but couldn't find any buyers and turned it over to the league in 1974.

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