Initialism
- MARV, a maneuverable reentry vehicle, a type of missile warhead
- M.A.R.V., otherwise known as the Mammoth Armed Reclamation Vehicle, a fictional tank from Command & Conquer 3: Kane's Wrath
- MARV, a financial services company based in New York focusing on structured products
- Marv, a G Casino Thanet abbreviation of the word "marvellous", used with cynicism and in a sarcastic tone to reflect a negative sense of feeling, after a bad beat in a poker hand, for instance
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