TTR can refer to one of the following:
- Time in therapeutic range, a metric of how well patients are managed on warfarin therapy
- Tap Tap Revenge, a video game
- Twin/Tone Records
- Tonopah Test Range
- TopTenReviews, a film and product review website
- Transthyretin, a plasma protein
- Time to repair or time to react, used in service level agreement conditions
- Trinidad and Tobago Regiment
- Thermal transfer ribbon, used in thermal transfer printers
- Talleyrand Terminal Railroad
- Tripping the Rift, a computer-animated TV Show that was aired on the Sci-Fi Channel
- Transaction Tax Resources, a sales and use tax research firm
- Ticket to Ride may refer to:
- Ticket to Ride song by The Beatles from their 1965 album, Help!.
- Ticket to Ride (board game), a railway-themed board game by Alan R. Moon
- Ticket to Ride (video game) a video game adaptation of the board game for Xbox Live Arcade
- Ticket to Ride (book), a book by Larry Kane about The Beatles
- Ticket to Ride (album), an album by The Carpenters
- Ticket to Ride (World Snowboard Tour)
- Ticket to Ride (novel), a novel by Dennis Potter