This study focuses on the host-parasite relationships between species of non-biting midges (Diptera: Chironomidae) and watermites (Acari: Hydrachnidia) in seven springs in Luxembourg. Emergence traps were operated through the season, and identificationof the catches enabled an overview of species composition, abundance and host-parasite associations in the spring communities.Our results show that the Luxembourg springs have similar chironomid diversity to other springs in Europe, and thatparticular species are more often found in certain spring habitats. Furthermore, we show that prevalence of water mite parasitismis highly variable among the sampled chironomid hosts, and that there are several species which were not parasitized despitebeing numerous in our samples. The reasons for the latter observation are discussed, and most of the cases can be explainedby general unavailability of host or parasite, or life cycle incompatibility.