DH5 (disambiguation) DH5 may refer to: Airco DH.5 a British First World War fighter aircraft DH5 alpha, a strain of E. coli A Good Day to Die Hard, the fifth film in the Die Hard film series Topics referred to by the same termThis 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.