- Gabbioceras
- Gabillytes
- Gaetanoceras
- Gagaticeras
- Galaticeras
- Galbanites
- Gangadharites
- Garantiana
- Gargasiceras
- Garniericeras
- Garnierisphinctes
- Gastrioceras
- Gastroplites
- Gattendorfia
- Gattenpleura
- Gaudryceras
- Gaurites
- Gauthiericeras
- Gazdaganites
- Gemmellaroceras
- Gentoniceras
- Genuclymenia
- Georgioceras
- Germariceras
- Gevanites
- Geyeroceras
- Girtyoceras
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- Glabrophysodoceras
- Glamocites
- Glaphyrites
- Glassoceras
- Glatziella
- Glaucolithites
- Gleboceras
- Gleviceras
- Glochiceras
- Glottoptychinites
- Glyphidites
- Glyphiolobus
- Glyptarpites
- Glyptoceras
- Glyptoxoceras
- Gnomohalorites
- Gogoceras
- Goliathiceras
- Goliathites
- Goniatites
- Gonioclymenia
- Goniocyclus
- Gonioglyphioceras
- Gonioloboceras
- Gonioloboceratoides
- Gonionotites
- Gonolkites
- Goodhallites
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- Gracilisphinctes
- Gracilites
- Grambergia
- Grammoceras
- Grandidiericeras
- Graphoceras
- Gravesia
- Grayiceras
- Graysonites
- Gregoryceras
- Griesbachites
- Groebericeras
- Groenlandites
- Grossouvria
- Grossouvrites
- Guembelites
- Guhsania
- Guleilmites
- Guleimiceras
- Gulielmina
- Gunnarites
- Gyaloceras
- Gymnites
- Gymnodiscoceras
- Gymnoplites
- Gymnotoceras
- Gymnotropites
- Gyroceratites
- Gyroclymenia
- Gyronites
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