Caladenia filamentosa, commonly known as daddy-long-legs, is a plant in the orchid family Orchidaceae and is endemic to eastern Australia.

It is a ground orchid with a single hairy leaf and up to four, usually dark red flowers with long, drooping lateral sepals and petals.

Caladenia filamentosa is a terrestrial, perennial, deciduous, herb with an underground tuber and which sometimes grows in dense clumps.

It has a single, densely hairy, narrow linear leaf, 10–18 cm (4–7 in) long and 4–7 mm (0.2–0.3 in) wide.

[2][3][4] Caladenia filamentosa was first formally described by Robert Brown in 1810 and the description was published in Prodromus Florae Novae Hollandiae.