- Gammaropsis palmata
- Gammarus crinicornis
- Gammarus duebeni
- Gammarus finmarchicus
- Gammarus insensibilis
- Gammarus locusta
- Gammarus marinus
- Gammarus obtusatus
- Gammarus oceanicus
- Gammarus salinus
- Gammarus tigrinus
- Gammarus zaddachi
- Gastrosaccinae
- Gastrosaccus lobatus
- Gastrosaccus normani
- Gastrosaccus sanctus
- Gastrosaccus spinifer
- Geryon tridens
- Gitana sarsi
- Gitanopsis bispinosa
- Gnathia maxillaris
- Gnathia oxyuraea
- Gnathia vorax
- Goneplax rhomboides
- Grapsinae
- Guernea coalita
- Gyge branchialis
- Haploops setosa
- Haploops tubicola
- Hardametopa nasuta
- Harpinia antennaria
- Harpinia crenulata
- Harpinia mucronata
- Haustorius arenarius
- Hemigrapsus penicillatus
- Hemilamprops rosea
- Hemimysis lamornae
- Heterocythereis albomaculata
- Heteromysini
- Heteromysis formosa
- Heterotanais oerstedi
- Hippolyte varians
- Hippomedon denticulatus
- Homarus gammarus
- Hyale pontica
- Hyale prevosti
- Hyale stebbingi
- Hyas araneus
- Hyas coarctatus
- Hyperia galba