Polypodiidae

Polypodiidae may refer to:
 * Polypodiidae (cnidarians), a zoological family that only includes Polypodium hydriforme, a cnidarian parasite of fish eggs
 * Polypodiidae (plant), a botanical subclass of Equisetopsida sensu lato that includes the leptosporangiate ferns
 * Polypodiidae a botanical subclass that only includes the fern family Osmundaceae