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Current taxonomical keys are essential for better biodiversity knowledge. Moreover, accurate identification of groups of organisms known to act as disease vectors is vital in today’s world of change and the spread of zoonotic disease threats. This is especially relevant to bats and their parasites, given the events of recent years. The available keys of European Nycteribiidae (Diptera) are outdated and do not cover all the species currently known from Europe. Therefore, a summary key of 16 European species is provided in this paper. Based on published data from Europe, a total of 173 host–parasite interactions were observed between 16 European bat fly species and 31 host species (bats). The highest number of associations with different host species and the lowest specialization was observed in Penicillidia (P.) dufourii dufourii, followed by Nycteribia (N.) kolenatii, N. (N.) schmidlii and Phthiridium biarticulatum; most of the other species also had low specialization. Most species are oligoxenous, parasitizing on several families, and three species are stenoxenosus. Only one nycteribiid species, Basilia daganiae, was linked with only one host (Pipistrellus kuhlii). Myotis myotis has 12 associations with different bat fly species, followed by Plecotus auritus and Myotis daubentonii with 12 associations. A relatively high number of bat species were associated with only one bat fly species. In addition, we performed a bipartite analysis complemented by network indices and host specificity at the species and whole network levels, yielding new information in terms of ecology and the host–parasite relationships related to these groups of potential vectors (Nycteribiidae) and sources of zoonoses (bats). The parasite–host network composed of 16 nycteribiid species and 31 bat host species was characterized by a low network level specialization, low modularity, and low nestedness. Our findings also suggest a high probability of associated Nycteribiidae in bat taxa with a similar roosting ecology and phylogenetic relationship.