Team Logo. The Seattle Mariners are a team in Major League Baseball. They compete in the American League. Their name originates from the prominence of marine culture in the city of Seattle. Retrieved from "https://prosportsteams.fandom.com/wiki/Seattle_Mariners?oldid=16164" Categories: Major League Baseball teams American League teams AL West teams Teams in Washington Teams in Seattle Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.