Astrochapsa sipmanii is a little-known species of corticolous (bark-dwelling) lichen in the family Graphidaceae.

The lichen was formally described as a new species in 2015 by Gothamie Weerakoon and Robert Lücking.

The type specimen was collected by the first author from the Bukit Timah Nature Reserve at an elevation of 147 m (482 ft).

The species epithet sipmanii honours Dutch lichenologist Harrie Sipman, "for his contributions to our knowledge of Singapore lichens".

[1] The lichen has a thin, olive-brown thallus up to 10 cm (4 in) in diameter, and lacks a distinct medulla.