Elk may refer to a number of species of large deer:

• The name originates with Alces alces, the largest extant deer species, called elk in Europe and moose in North America.
• In North America it refers to Cervus elaphus, which is called a red deer in Europe, and a maral in Asia. The various North American subspecies are also called wapiti.
• In India it was used to refer to Cervus unicolor, commonly known as the sambar.
• The word is also used to indicate Megaloceros, the extinct giant deer or Irish elk.

Elk may also be:

• An old name for the Whooper Swan or possibly the Greylag Goose (according to the Oxford English Dictionary)
• Ełk, Poland, a town in Poland
• Elk, California, a town in the United States
• Elk, a member of the Benevolent and Protective Order of Elks fraternal organization
• Elk, the name of a British ferry
• ELK, an acronym for a shaft with which a mobile pallet (dolly) can be steered. This acronym is deduced from the German language and stands for "one-point handle joint" (Einpunkt-Lenk-Kupplung).
• Goodnight Elk, an indie net label.
• Elk, the name of a character in .Hack