Ter is a prefix or suffix designating the third instance of a thing, thus following bis and preceding quater.
Ter can also refer to:
- River Ter, in Essex;
- Ter (album), the debut album of American rock band Sweet Water
- Ter (river), in Catalonia;
- Ter, a short-lived former French département established in 1812 and named after the Ter river.
- Torre (river), or Ter in Slovene, a river in Italy;
- Ter, Ljubno, a settlement in the Municipality of Ljubno ob Savinji, Slovenia
- "Lord" (Armenian) - title of ordained clergy (before Christian name) and hereditary honorific of their descendants as part of the surname, such as "Ter-Petrossian".
- Ter_(chromosome), Parts of a chromosome – pter is short arm; qter is long arm;
- Ter (informal), short for terabyte, a computer term, or a units of information
TER can refer to the following:
- Lajes Air Base, the IATA airport code of Portuguese Air Force facility
- Technology Electronic Review
- TER (train type), an advanced Spanish train developed by Goicoechea
- TYPO3 Extension Repository, the central download website for extensions for the TYPO3 Content Management System
- Tertiary Entrance Rank, Australian tertiary entrance score
- The Erotic Review, An online database dedicated to reviews of female escorts
- Total Expense Ratio, performance measure for investment funds
- Transphase Eradication Rod (Stargate SG-1)
- Transport express régional, a regional service of the SNCF French rail network
- The NYSE stock symbol of Teradyne, Inc.