Other
- Hértevin language, ISO 639-3 language code hrt
- Higher Rate Taxpayer, in the UK
- Croatian Radiotelevision, a Croatian public broadcasting corporation
- High rising terminal, a feature of speech
- Hostage Rescue Team, an FBI counter-terrorism unit
- Humane Research Trust, a British medical research charity
- Hydraulic retention time, the average length of time that a soluble compound remains in a constructed reactor
- The local name of the Old Croatian Sighthound
Read more about this topic: HRT