It has a single erect, flat, leathery leaf and up to twelve crowded, cinnamon scented, orange-coloured flowers with reddish brown edges.

Thelymitra yorkensis is a tuberous, perennial herb with a single erect, flat, leathery, lance-shaped to egg-shaped leaf 50–140 mm (2–6 in) long and 20–40 mm (0.8–2 in) wide.

[2][3][4][5] Thelymitra yorkensis was first formally described in 2006 by Jeff Jeanes from a specimen collected near York and the description was published in Muelleria.

[6][5] The specific epithet (yorkensis) refers to the town near where all known populations occur.

[2][3][7] Thelymitra yorkensis is classified as "Priority Three" by the Government of Western Australia Department of Parks and Wildlife[7] meaning that it is poorly known and known from only a few locations but is not under imminent threat.