In this study, freshwater Oligochaeta samples which were collected between the years 1985 and 1999 from different localities in Turkish Thrace were evaluated taxonomically. A total of 11 Oligochaeta species were determined. Also, all printed taxonomical studies on aquatic and semi-aquatic Oligochaeta fauna which were performed in Turkish Thrace until the present were discussed in this paper. As a result, it was gathered that a total of 37 species belonging Oligo-chaeta have been reported from Turkish Thrace. While the family Naididae was the most en-countered group with 27 species, it was followed by the family Enchytraeidae with 7 species. The families Haplotaxidae, Lumbricidae, and Propappidae were represented by only one spe-cies in Turkish Thrace.