Organisations
- Hellenic Mathematical Society, a Greek learned society
- Hind Mazdoor Sabha, a trade union in India
- Historical Maritime Society, a British naval reenactment society
- Hendrick Motorsports, NASCAR racing team
- Harakat Mujtama' as-Silm, or Movement of Society for Peace, an Algerian Islamist political party
- HMS, National Rail station code of Helmsdale railway station, Scotland
- HMS Industrial Networks, a Swedish-based industrial communications company
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