Doodia is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, in the suborder Aspleniineae (eupolypods II).

[2] Distribution of the genus includes parts of Australia and New Zealand.

[3] Phylogenic studies found Doodia to be embedded within the paraphyletic Blechnum as then circumscribed.

[5][6] The alternative taken in the Pteridophyte Phylogeny Group classification of 2016 (PPG I) is to split Blechnum into a number of smaller genera, including Doodia.

[1] As of August 2019[update], the Checklist of Ferns and Lycophytes of the World accepted the following species:[7]