The limnic ostracod fauna from some Danube Delta lakes was investigated. Eighteen species were recorded, and a brief description including information on the ecology and the geographical distribution of the main species was provided. Cypria ophthalmica was the most frequent and abundant species, followed closely by Darwinula stevensoni. A brackish water assemblage, represented by Cyprideis littoralis, Tyrrhenocythere amnicola donetziensis and Cytheromorpha fuscata was identified only in the Razelm-Sinoe lagoon
