Ptilozamites is an extinct genus of pteridosperm (colloquially known as "seed ferns"), known from the Triassic and Early Jurassic of the Northern Hemisphere.

[1] The genus was first erected by Alfred Gabriel Nathorst in 1878 for remains found in Scania in southern Sweden.

Most authors interpret Ptilozamites as an enigmatic "seed fern" (a seed plant, typically with fern-like leaves, of uncertain affinities), though some authors historically suggested that they were related to cycads.

[2] The leaves of Ptilozamites are pinnate (that is, arranged like that of a typical fern, with pairs of parallel leaflets/pinnules projecting from a central axis).

[1] Ptilozamites was widespread across the Northern Hemisphere during the Late Triassic and Early Jurassic, with remains having been reported from Europe,[3] Greenland[2] and China.