The blue whale is the largest species of whale, and the largest species of all animal species.

Blue whale may also refer to:

• Blue Whale Harbour, an anchorage on South Georgia Island
• Blue Whale Mountain, a mountain on South Georgia Island
• Blue Whale Systems, a British mobile phone services software company
• Blue Whale of Catoosa a waterfront structure, just east of Catoosa, Oklahoma
• Blue Whale Jazz Club, a jazz club in Los Angeles
• Blue Whale Challenge, an online game that reportedly features suicide as the end goal
• Blue Whale 1, a rocket developed by Perigee Aerospace
• A short-lived band featuring drummer Aynsley Dunbar
• Nickname of Center Blue, a large building within the Pacific Design Center
• BlueWhale, a German-Israeli unmanned underwater drone (UUV) from ELTA Systems Ltd. and Atlas Elektronik