Ur, or ur may refer to:
- Ur, an ancient city in southern Mesopotamia
- Hayy Ur, a neighborhood of eastern Baghdad, Iraq
- Úr ᚒ, a letter of the Ogham alphabet
- Ur (rune) ᚢ, a letter of the runic alphabets
- Royal Game of Ur, two game boards found in Royal Tombs of Ur and dating from the First Dynasty of Ur, before 2600 BC
- Ur (continent), the first known continent
- Ur-, an English and German prefix, meaning original, primitive
- Proto-World language, also called "Ur"
- Ur, Pyrénées-Orientales, a commune of the Pyrénées-Orientales département in south-western France
- A codename for the Polish Karabin przeciwpancerny wzór 35 anti-tank rifle
UR or ur is an abbreviation for:
- Canton of Uri, Switzerland
- Underground Resistance, a US techno music label
- Underlying representation in phonology
- Urdu language (ISO 639 alpha-2, ur)
- The first person shooter PC game Unreal or the series of games
- "Your" or "you're", especially in internet slang or SMS language
- "Ur-Quattro", meaning the original Audi Quattro, 1980-1991
- Update Release
UR is an abbreviation for several universities:
- University of Regina, in Canada
- University of Richmond, in the United States
- University of Rochester, in the United States
- University of Rhode Island, in the United States
- Universidad Regiomontana, in Mexico
