木贼纲（学名：Equisetopsida），又名楔叶纲或楔叶蕨纲（Sphenopsida），是蕨类植物门之下的一个纲。

Equisetopsida, or Sphenopsida, is a class of vascular plants with a fossil record going back to the Devonian. They are commonly known as horsetails. Living horsetails are represented by about twenty herbaceous species in the single genus Equisetum. They typically grow in wet areas, with whorls of needle-like branches radiating at regular intervals from a single vertical stem.