Other
- Haagsche Tramweg Maatschappij (now HTM Personenvervoer NV), the Hague public transport company in the Netherlands.
- Harmful to Minors, a novel
- Holy Transfiguration Monastery in Brookline, Massachusetts, the chief institution of the schismatic Holy Orthodox Church in North America
- "Heavens to Murgatroyd!", an expression popularized by Snagglepuss
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