Battle of the Bay

Battle of the Bay can refer to:

Sports

 * Battle of the Bay (rivalry), a college football rivalry between the Hampton Pirates and the Norfolk State Spartans
 * Bay Bridge Series, a sports rivalry around the San Francisco Bay in the United States
 * The 1989 World Series, a specific set of games featuring said sports rivalry, made notable by the 1989 Loma Prieta earthquake
 * Battle by the Bay, a series of Street Fighter tournaments
 * 49ers–Raiders rivalry, a football rivalry between the San Francisco 49ers and the formerly-Oakland Raiders

Military

 * The series of running battles between RAF Coastal Command and German U-boats in the Bay of Biscay in WWII
 * Battle of Hudson's Bay, a historical naval battle in Hudson's Bay in Canada