- Radstockiceras
- Raimondiceras
- Rakusites
- Ramosites
- Rasenia
- Rasenoides
- Raymondiceras
- Rectoclymenia
- Reesidites
- Rehmannia
- Reiflingites
- Reineckeia
- Reineckeites
- Renites
- Renziceras
- Repossia
- Reticuloceras
- Retites
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- Reynesella
- Reynesoceras
- Reynesocoeloceras
- Rhabdoceras
- Rhacophyllites
- Rhadinites
- Rhaeboceras
- Rhampidoceras
- Rhiphaeoclymenia
- Rhiphaeocyclus
- Rhymmoceras
- Rhytidohoplites
- Riasanites
- Richardsonites
- Rimkinites
- Ringsteadia
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- Roinghites
- Rollerites
- Rollieria
- Roloboceras
- Romaniceras
- Romanites
- Rossalites
- Rotodiscoceras
- Rotopericyclus
- Rubroceras
- Rugiferites
- Rursiceras
- Rusoceras
- Ryugasella
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