The first record of mites in the parenchyma of Juncus procerus in marshey wetlands in the region of Bio Bio, Chile, is presented. Nine genera and families and three suborders were found. Eight species are new records for Chile and have not been previously cited as mites associated with aquatic environments. They are the following: Mesostigmata: Holoparasitus sp. and Hypoaspis sp., Prostigmata: Trombidium sp., Trombiculidae sp., Balastium sp., Cyta sp. and Eupodes sp.; and Oribatida: Pergalumna sp. Facts about habitats and known distribution are included for all found taxa