Ginkgoidae is a subclass of Equisetopsida in the sense used by Mark W. Chase and James L. Reveal in their 2009 article "A phylogenetic classification of the land plants to accompany APG III.

"[1] This subclass contains the single extant genus Ginkgo under order Ginkgoales, family Ginkgoaceae.

[2] Its only extant species is Ginkgo biloba, the Maidenhair Tree.

The following diagram shows a likely phylogenic relationship between subclass Ginkgoidae and the other Equisetopsida subclasses.

[2] Marchantiidae Bryidae Anthocerotidae Lycopodiidae Equisetidae Marattiidae Ophioglossidae Polypodiidae Cycadidae Ginkgoidae Gnetidae Pinidae Magnoliidae