There are two meanings of HMAT:
In UK Royal Navy use, HMAT is "His/Her Majesty's Armed Transport" and may refer to HMAT Supply among others.
In Royal Australian Navy use, HMAT is "His/Her Majesty's Australian Transport" and may refer to the following Australian troopships:
HMAT Afric HMAT Ascanius HMAT Bulla HMAT Euripides HMAT Medic HMAT Orontes HMAT Persic HMAT Runic HMAT Shropshire HMAT Suevic HMAT Wandilla HMAT Warilda