Arge similis, common name azalea argid sawfly, is an insect species from the family Argidae.

[1] The species was originally described by Samuel Constantinus Snellen van Vollenhoven.

[5] This stale-blue sawfly has a length about 10 millimetres, with a hairy head.

It has a dark-blue colour and its head is covered with short hair.

[2] The species was described from four female samples which are part of the collection of the Natural History Museum, Leiden and collected by Philipp Franz von Siebold in Japan.