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- Cortinarius rainierensis
- Cortinarius raphanoides – edible, but deadly look-alikes (C. gentilis)
- Cortinarius regalis
- Cortinarius renidens
- Cortinarius rigidus
- Cortinarius roseoarmillatus
- Cortinarius rotundisporus – (Australia)
- Cortinarius rubellus
- Cortinarius rubicundulus
- Cortinarius rubripes
- Cortinarius rufo-olivaceus
- Cortinarius rugosolilacinus
Read more about this topic: List Of Cortinarius Species