HM3 can refer to:
- Hannah Montana 3, a soundtrack for the Hannah Montana TV series
- United States Navy Hospital Corpsman, Third Class (E-4)
- A Human Genome Organisation symbol for muscarinic acetylcholine receptor M3
- One of the implementations of Modula-3
- Horological Machine No.3, a timepiece from MB&F
hm³ can refer to:
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