Idiopidae, also known as armored trapdoor spiders, is a family of mygalomorph spiders first described by Eugène Simon in 1889. They have a large body similar to tarantulas.

In some species the males have a spur on their legs, which they will show if provoked. Idiopidae build burrows, and some species close these with a door. The about 2 cm long Prothemenops siamensis from Thailand builds its retreat in a streamside vertical earth bank in lower montane rain forest. Each burrow had two or three entrances that lead into a main tube. Its lateral posterior spinnerets are elongated. The oldest known idiopid, Number 16, died at the age of 43 years.

As of 2019, the World Spider Catalog accepts the following genera: - Arbanitis L. Koch, 1874 — Australia - Blakistonia Hogg, 1902 — Australia - Bungulla Rix, Main, Raven & Harvey, 2017 — Australia - Cantuaria Hogg, 1902 — New Zealand, Australia - Cataxia Rainbow, 1914 — Australia - Ctenolophus Purcell, 1904 — South Africa - Eucanippe Rix, Main, Raven & Harvey, 2017 - Eucyrtops Pocock, 1897 — Australia - Euoplos Rainbow, 1914 — Australia - Gaius Rainbow, 1914 — Australia - Galeosoma Purcell, 1903 — South Africa, Mozambique, Botswana - Genysa Simon, 1889 — Madagascar - Gorgyrella Purcell, 1902 — Zimbabwe, Tanzania, South Africa - Heligmomerus Simon, 1892 — Africa, Asia - Hiboka Fage, 1922 — Madagascar - Idiops Perty, 1833 — South America, Africa, Asia, Saint Vincent and the Grenadines - Idiosoma Ausserer, 1871 — Australia - Neocteniza Pocock, 1895 — Central America, South America - Prothemenops Schwendinger, 1991 — Thailand - Scalidognathus Karsch, 1892 — India, Sri Lanka - Segregara Tucker, 1917 — South Africa - Titanidiops Simon, 1903 — Morocco