H30 or H-30 may refer to:
- H30 (Long Island bus), in Suffolk County, New York
- Dongfeng Fengshen H30, a Chinese hatchback
- HMS Beagle (H30), a Royal Navy B-class destroyer
- HMS H30, a Royal Navy H class submarine
- McCulloch H-30, an American tandem-rotor helicopter
- Nissan H30, an automobile engine
See also edit
- Hydronium (H3O+), with a letter O instead of a zero
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