TXT or txt may refer to:
- SMS language or txt, an Internet slang language commonly used on short message service phones
- .txt, a filename extension for text files
- Text messaging on a phone using letters and symbols.
- Trusted Execution Technology, Intel's implementation of Trusted Computing
- TXT e-solutions an international software development and consulting company focussing on business applications.
- TXT records, a type of Domain Name System record used for several purposes
- TxT (film), a 2006 Filipino horror film
txt, the ISO639-3 language code for Citak language, a Papuan language spoken in Citak-Mitak kecamatan (subdistrict), Mappi Regency, Indonesia.