Nigerian cultures, as diverse and rich as they are, are not adequately promoted and as such tourism is insignificant in various locations, communities and societies in Nigeria. Cultures, which embrace peoples? ways of existence and co-existence, are sustained by knowledge, most of which are provided by public libraries, promoted and proliferated through tourism. Thus, this study was focused on how public libraries are promoters of cultures and tourism; bringing to the fore, public library services that are culture-related and those that are tourism-related. After much review by the author, practical recommendations on how public libraries could promote cultures and tourism were made. This monograph has Nigerian peoples as its major target, though the knowledge contained could also be improvised and made suitable for any society.