Taxonomy of seven large and little-known large species of Lenticulina Lamarck, 1804 in Icelandic waters (753,000 km2) is revised and their spatial distribution is documented in relation to temperature, depth, and salinity. Knowledge of Lenticulina in Recent sediments of the North Atlantic, relies mainly on studies in the late 19th and early 20th centuries, that used large volume samplers. Since then, species of Lenticulina in the studied area, have nearly completely evaded all subsequent studies, as these have focused on quantitative studies using small volume samplers. This study analysed 879 dredge samples where seven Lenticulina species occurred in 238 samples, comprising 1,239 specimens. Species descriptions are revised and illustrated with high resolution photographs of micro- and megalospheric generations. The species are absent from the Arctic (-1°C) deep-water basins north of the GSR (Greenland-Scotland Ridge) but are frequent in the temperate shallow and deep-water masses of the North Atlantic south of the GSR. The distributional ranges of the species are grouped into four ecological types: (1) Lenticulina novangliae and Lenticulina torrida span a wide range of depth, temperature, and salinity. (2) Lenticulina glabrata and Lenticulina gibba are most frequent in shallow and temperate waters north off Iceland. (3) Lenticulina atlantica and Lenticulina dorbignii are present in the shallow waters south and west off Iceland. (4) Lenticulina occidentalis is restricted to deep waters south of the GSR. It is found unlikely that more species of Lenticulina will be discovered in the area using the present methodology.