Annesijoa is a monotypic genus of plants in the family Euphorbiaceae.

[2] The sole species, Annesijoa novoguineensis is endemic to New Guinea.

Annesijoa is a taxonomic anagram derived from the name of the confamilial genus Joannesia.

The latter name is a taxonomic patronym honoring the king John VI of Portugal.

[3] This Euphorbiaceae-related article is a stub.