There are several rivers named Don:
- Don River, Russia, one of the main rivers of Russia.
- River Don, Scotland, a river in Scotland which rises in the Grampians and flows 131 km (82 miles) eastwards to the North Sea at Aberdeen.
- River Don, England, a river in South Yorkshire which rises in the Pennines and flows 112 km (70 miles) eastwards to join the River Ouse shortly before it, in turn, joins the Humber.
- Don River, Toronto is one of two major rivers framing Toronto against Lake Ontario.
The word Don also stands for:
- Danu, the mother goddess in Insular Brythonic mythology.
- an abbreviated form of the male Christian name Donald.
- in English universities, a head, fellow or tutor of a college.
- in Spanish, a title prefixed to a man's Christian name, e.g. Don Juan, Don Quijote, or in the operas Don Carlos, Don Giovanni, Don Pasquale. Hence it is also a (rather old-fashioned) slang name for a Spaniard. The word appears in Henry Newbolt's poem Drake's Drum: "If the dons sight Devon, I'll quit the port of heaven...". It is abbreviated as D.
- a mafia or underworld don - the head of an organised crime gang.