Cortinarius jenolanensis is a fungus native to Australia.

It was described in 2009 by Alec Wood, from a specimen collected at the Jenolan Caves on 30 April 1988.

It has also been recorded from Tidbinbilla Nature Reserve in the Australian Capital Territory.

[2] The fruit body has a 4 cm (1+1⁄2 in) wide dark violet cap that is initially dome-shaped and becomes flattish as it matures.

The thin crowded wide dark purple gills are adnate to decurrent, and become more rusty brown as the spores mature.