- Heterorhabdus norvegicus
- Heterorhabdus papilliger
- Heterorhabdus robustus
- Heterorhabdus spinifrons
- Heterorhabdus tanneri
- Heterorhabdus vipera
- Heterostylites longicornis
- Heterostylites major
- Heteroteuthis dispar
- Heterotiara anonyma
- Heterotiara minor
- Hexacontium aristarchi
- Hexacontium armatum/hostile
- Hexacontium laevigatum
- Hexaconus ciliatus
- Hexaconus echinatus
- Hexaconus infundibulum
- Hexaconus nivalis
- Hexaconus serratus
- Hexaconus trypanon
- Hexalaspis heliodiscus
- Hexalaspis sexalata
- Hexapanopeus angustifrons
- Hexapanopeus caribbaeus
- Hexapanopeus heblingi
- Hexapanopeus manningi
- Hexapanopeus paulensis
- Hexapanopeus schmitti
- Hippopodius hippopus
- Hirondellea brevicaudata
- Histioteuthis bonnellii
- Histioteuthis reversa
- Holophrya pelagica
- Holoplites armata
- Holosticha diademata
- Homoeonema platygonon
- Homola barbata
- Hormiphora plumosa
- Hyalocylis striata
- Hyaloteuthis pelagica
- Hybocodon prolifer
- Hybocodon unicus
- Hydractinia minima
- Hydractinia minuta
- Hydractinia tenuis
- Hydractinia tournieri
- Hyperamblyops megalops
- Hyperia crassa
- Hyperia curticephala
- Hyperia macrocephala