Austromuellera trinervia, commonly known as Mueller's silky oak, is a species plant in the macadamia family Proteaceae, endemic to north-eastern Queensland, Australia. It was described in 1930 by Cyril Tenison White, and has been given the conservation status of near threatened by Queensland authorities.
Austromuellera trinervia is a tree reaching up to about tall. The compound leaves leaves grow to about in length, with more than six pairs of leaflets. Each of the leaflets measure up to long and wide, and they have three or four longitudinal veins.
Numerous honey-coloured flowers are produced on racemes about long, each with tepals measuring long and a style long. The fruit is a flat capsule about long and wide, containing a dozen or more winged seeds up to long.
Mueller's silky oak flowers between November and January.
This species inhabits rainforest and occurs in two widely separated populations within Queensland's Wet Tropics World Heritage Area. One is in the area from Rossville to the Daintree River, and the other is on the eastern edge of the Atherton Tableland around Boonjee and Butcher's Creek. The altitudinal range is from sea level to about .
It was first described by Australian botanist Cyril Tenison White in 1930, based on plant material he collected himself at Boonjee in 1923.
The International Union for Conservation of Nature assessed this species in 2019 and gave it the classification of least concern, however, under Queensland's Nature Conservation Act it is considered to be near threatened.