Lamprohaminoea evelinae 
Leafy Hornmouth 
Leech Aglaja 
Lehmannia marginata 
Leopard Sea Slug 
Leopard slug 
Leptopoma atricapillum 
Leptopoma perlucidum 
Leptopoma sericatum 
Leptopoma undatum 
Lettuce sea slug 
Levantina caesareana 
Levantina spiriplana 
Levantine Field Snail 
Lewis's moon snail 
Limaeus 
Limenandra barnosii 
Lined Cratena 
Lined Nembrotha 
Lined sea hare 
Lion Nudibranch 
Lissachatina fulica 
Little Egg Cowry 
Littorina plena