H31 may refer to: Hanriot H.31, a French biplane fighter aircraft , a Royal Navy G-class destroyer later transferred to the Royal Canadian Navy and renamed HMCS Ottawa (H31) , a Royal Navy H class submarine
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H31 may refer to: Hanriot H.31, a French biplane fighter aircraft , a Royal Navy G-class destroyer later transferred to the Royal Canadian Navy and renamed HMCS Ottawa (H31) , a Royal Navy H class submarine