Cycadeoidea is an extinct genus of bennettitalean plants known from the Cretaceous (and possibly the Jurassic) of North America, Europe and Asia.

The reproductive structures are bisexual (i.e. having a combined male and female organ), and are deeply sunken into the stem on the axils of the leaves, and they are surrounded by scales and embedded within the persistent leaf bases.

[4] Cycadeoidea gibsoniana is a species collected from Lower Greensand from Luccombe Chine on the Isle of Wight, notable for the remarkable state of preservation of its plant parts.

The original specimen was found by Thomas Field Gibson and was extensively broken and sliced to examine its anatomy.

[4][7] Four well preserved cones of a species C. maccafferyi were uncovered in the Upper Cretaceous Haslam Formation on Vancouver and Hornby Island in British Columbia.