T1, T01, T.1 or T-1 may refer to:
Places
In space
- T1 Aquarii, a star in the constellation Aquarius
- T1 Carinae, a star in the constellation Carina
- 1293 T-1, the asteroid "T-1", a main-belt asteroid, the 1293rd asteroid registered
Rail lines
Roads
Biology
Computing, electronics
Telecommunications
- T1, a component of the T-carrier system for telecommunication
- AYYA T1, a smartphone developed by Rostec as part of the Ayya (smartphone) line
- T1 Phone, see Trump Mobile
- vivo T1 series, the 5 smartphones manufactured by Vivo Communication Technology Co.
Transportation
Aircraft
Automobiles
Rail
Racing
Ships
Buses
Tanks and weapons
Mathematics, physics and chemistry
Sports
Arts, entertainment, media
- The Terminator, the 1984 first film in the Terminator franchise, predecessor to 1991's T2: Judgment Day
- Trainspotting (film), 1996 film, predecessor to 2017's T2 Trainspotting
- T1 (album), 2018 album by Tatianna
- Tekken (T1, Tekken 1), a 1994 fighting game, first entry in the videogame series
- module T1, a Dungeons & Dragons add-on module
Other uses
- T1 General, a tax form used in Canada
- T-1 visa, allowing victims of human trafficking to remain in the United States
- T1, a tornado intensity rating on the TORRO scale
- T1 (Torx), size 1 for Torx screwheads
- T+1, "trade date plus one day" in financial markets
- Tyler1, an American internet personality and streamer on Twitch
See also