| lesser sandhill crane | Kleiner Kanadakranich |
| lesser scaup | Veilchenente |
| lesser scaup duck | Veilchenente |
| lesser seed finch | Schwarzkopf-Reisknacker |
| lesser seedcracker | Grantastrild |
| lesser short-toed lark | Stummellerche |
| lesser shortwing | Zwergkurzflügel |
| lesser siren | Kleiner Armmolch |
| Lesser Slave Lake | Kleiner Sklavensee |
| lesser snapdragon | Feldlöwenmaul |
| lesser sooty owl | Fleckenrußeule |
| lesser soupfin shark | Kleiner Suppenflossenhai |
| lesser spearwort | Brennender Hahnenfuß |
| lesser speckled bush cricket | Weissfleckige Zartschrecke |
| lesser speckled bush-cricket | Weissfleckige Zartschrecke |
| Lesser Spotted Eagle | Schreiadler |
| lesser spotted woodpecker | Kleinspecht |
| lesser striped swallow | Maidschwalbe |
| lesser sulphur-crested cockatoo | Gelbwangenkakadu |
| Lesser Sunda Islands | Kleine Sunda-Inseln |
| lesser swallow-tailed swift | Kleiner Schwalbensegler |
| lesser swamp warbler | Kaprohrsänger |
| lesser tchagra | Sumpftschagra |
| lesser thorn-tipped longhorn beetle | Dorniger Wimperbock |
| lesser thyme-leaf sandwort | Dünnstengeliges Sandkraut |
| lesser thyme-leaved sandwort | Dünnstengeliges Sandkraut |
| lesser thymeleaf sandwort | Dünnstengeliges Sandkraut |
| Lesser Town of Prague | Prager Kleinseite |
| lesser tree swift | Ohrenbaumsegler |
| Lesser Vasa Parrot | Kleiner Vasapapagei |
| lesser wagtail tyrant | Braunrückentachuri |
| lesser water fern | kleiner Algenfarn |
| lesser wax moth | Kleine Wachsmotte |
| lesser weasel lemur | Kleiner Wiesel-Maki |
| lesser weever | Kleines Petermännchen |
| lesser whistling duck | Zwergpfeifgans |
| lesser white-fronted goose | Zwerggans |
| Lesser White-toothed Shrew | Gartenspitzmaus |
| Lesser Whitethroat | Müllerchen |
| lesser whitethroat warbler | Klappergrasmücke |
| lesser woodcreeper | Schlankschnabel-Baumsteiger |
| lesser wren babbler | Brustfleckentimalie |
