An extensive overview of Recent and Holocene ostracods from brackish and marine environments of Portugal is presented for the first time. 178 species belonging to 75 genera have been found and all are listed and illustrated with SEM images. From those species only 30 were found alive, most of them living in marginal-marine environments. Some comments on the 30 species found alive and a summary of main results are also presented. The data come from unpublished notes, reports of several research projects, observations on Recent ostracods in sediments from different estuaries of the western coast of Portugal and from the western Algarve continental shelf and slope, Masters theses and published papers.