Crinozoa is a subphylum of mostly sessile echinoderms, of which the crinoids, or sea lilies and feather stars, are the only extant members.

[3] When Blastozoa was erected to contain stalked forms with brachioles rather than arms, only Crinoidea and Paracrinoidea remained within Crinozoa.

[2] One proposal for the cladistic placement of the Homalozoan classes groups Stylophora together with crinoids to form Crinozoa.

[7] A 2024 survey of recent research finds more support for Homalozoa as a paraphyletic assemblage along the echinoderm stem group, but noted that the position of Stylophora in particular was uncertain.

[8] If neither Paracrinoidea nor Stylophora can be included, Crinozoa would be equivalent to the Crinoidea total group.