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- Cortinarius maculobulga
- Cortinarius magnivelatus
- Cortinarius malachius
- Cortinarius malicorius – also known as Dermocybe malicoria (North America)
- Cortinarius marylandensis
- Cortinarius metallicus (previously Rozites metallica) (Australia)
- Cortinarius metarius
- Cortinarius michiganensis
- Cortinarius miniatopus
- Cortinarius montanus
- Cortinarius mucifluus
- Cortinarius mucosus
- Cortinarius multiformus – eaten in Europe, unknown edibility in North America
- Cortinarius mutabilis
Read more about this topic: List Of Cortinarius Species