HDP
- Free Democratic Party (Turkey)
- HD Photo
- HDP (Pluribus)
- HDP (album)
- Hadapsar railway station
- Hazara Democratic Party
- Health Device Profile
- Heme ligase
- Hemodialysis product
- Heritage Documentation Programs
- Hierarchical Dirichlet process
- Hierarchical decision process
- Historical Dictionary Project of the Hebrew Language
- Hortonworks
- Hurricane Destruction Potential
- Hydrocarbon dew point
- Hydroxypropyl distarch phosphate
- Peoples' Democratic Party (Turkey)