The word dolphin can mean:

• The most common use of the word dolphin is to describe the aquatic mammal. See dolphin.
• Dolphin (or more properly, dolphinfish) is also used to describe a species of fish, Coryphaena hippurus, which is unrelated to the mammal.

The name is being used less frequently than in times past, and has generally been replaced with its Polynesian name, mahi-mahi, to avoid confusion with the mammal, especially since the fish is commonly eaten. In Spanish, this fish is also referred to as a dorado.

• Dolphin was the code name for the Nintendo GameCube before it was released.
• Dauphin (French for dolphin) was a title given to the heir apparent to the French throne, received originally from Humbert II.
• "Dolphins" are the common name for the United States Navy's Submarine Warfare insignia.
• Ships in the Navy have been named USS Dolphin.
• Dolphin Helicopter - a naval helicopter used by the Israel Navy.
• Miami Dolphins is a football team.
• Dolphins is an IMAX movie directed by Greg MacGillivray
• Dolphin is a DC Comics superheroine.
• Dolphin is also the pseudonym of a Russian rock star/band.