H3
- 3H (disambiguation)
- ATC code H03
- Alstom Prima H3
- Brilliance H3
- British NVC community H3
- Dynali H3 EasyFlyer
- GNR Class H3
- Gerovital H3
- Great Wall Haval H3
- H-3 Air Base
- H3 (Kuwait)
- H3 (classification)
- H3 (film)
- H3 (pyrotechnics)
- H3 (rocket)
- H3 (yacht)
- H3 Entertainment
- H3 Monks Way
- H3 Podcast
- H3 – Halloween Horror Hostel
- HHH (disambiguation)
- HTML element
- HTTP/3
- Happy Hustle High
- Hash House Harriers
- Hekla 3 eruption
- Histamine H3 receptor
- Histone H3
- Howland H-3 Pegasus
- Huansu H3
- Hugh Hardy
- Hummer H3
- IFA Horch H3
- Interstate H-3
- John Harrison
- List of Sony Cyber-shot cameras
- List of automotive light bulb types
- METRORail
- Rely H3
- Sikorsky SH-3 Sea King
- Socket H3
- Standard H-3
- Triatomic hydrogen
- Trihydrogen cation
- Triple H (disambiguation)
- Tritium
- Uber
- VFW-Fokker H3 Sprinter