Leptodontaceae is a family of mosses belonging to the order Hypnales. There are 3 genera with a worldwide distribution.

Most of the genera of family Leptodontaceae, originally came from family Neckeraceae, Such as Caduciella came into Leptodontaceae in 1991.

It originally comprised Alsia, Forsstroemia, and Leptodon. Recently described or relocated genera in the family include Caduciella Enroth, Cryptoleptodon Renauld & Cardot, and Taiwanobryum Noguchi (J. Enroth 1992). Molecular evidence indicates that this small family may not be monophyletic.

Family Leucodontaceae now contain Forsstroemia and Alsia. Although some sources note that they are back within the Neckeraceae family. Later Cryptoleptodon moved into family Pterobryaceae, and Taiwanobryum moved into family Prionodontaceae.

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