Mototi Octopus 
Mulberry Whelk 
Murex tenuirostrum 
Murex ternispina 
Myurellopsis paucistriata 
Naisdoris vitiligata 
Naked sea butterfly 
Naticarius orientalis 
Needle Cuttlefish 
Nembrotha chamberlaini 
Nembrotha livingstonei 
Nembrotha mullineri 
Nembrotha purpureolineolata 
Nembrotha yonowae 
Nerita versicolor 
Nesiohelix swinhoei 
Ninja Slug 
Noah's Giant Clam 
Northern abalone 
Northern Pygmy Squid 
Notobryon wardi 
Notodoris minor 
Notodoris serenae 
Novisuccinea ovalis