Amphidium is a genus of mosses belonging to the monotypic family Amphidiaceae. It has previously been placed in families Orthotrichaceae and Rhabdoweisiaceae.

The genus has a cosmopolitan distribution.

Species:

• Amphidium asiaticum Sim-Sim, Afonina & M. Stech
• Amphidium brevifolium Broth.
• Amphidium californicum (Hampe ex Müll. Hal.) Broth.
• Amphidium clastophyllum Cardot
• Amphidium curvipes (Müll. Hal.) Broth.
• Amphidium lapponicum (Hedw.) Schimp.
• Amphidium letestui Thér. & P. de la Varde
• Amphidium mougeotii (Bruch & Schimp.) Schimp.
• Amphidium papillosum E.B. Bartram
• Amphidium remotidens (Müll. Hal.) Broth.
• Amphidium tortuosum (Hornsch.) Cufod.

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