MHW may be an abbreviation for:
Marine heatwave Mbukushu language (ISO 639 code: mhw), spoken in Namibia Mean high water Mental health worker, a medical abbreviation Monster Hunter: World, a 2018 video game Monster Hunter Wilds, a 2025 video game Monteagudo Airport (IATA: MHW), Bolivia
See also MHW-RTG (Multihundred-watt radioisotope thermoelectric generators)