NNH (disambiguation) NNH may refer to: Number needed to harm, an epidemiological measure nnh, the ISO 639-3 code for Ngiemboon language Nou Nou Hau, an avant-garde dōjinshi manga anthology Natal Native Horse Topics referred to by the same term This disambiguation page lists articles associated with the title NNH.If an internal link led you here, you may wish to change the link to point directly to the intended article.