H34, H.34 or H-34 may refer to: * Hanriot H.34, a French Hanriot aircraft * HMS H34, a British H class submarine * Sikorsky H-34, a helicopter and also : * Retinal vascular occlusions code * Spanish language Chinese Library Classification code * East Donegal vice-county code * ORP Błyskawica, a Grom class destroyer This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article.