Oonops domesticus is a tiny spider (males about 1.5 mm, females 2 mm) from Western Europe to Russia.

It is a bleak light red, with a reddish to whitish abdomen.

It hunts at night, probably with booklice as their common prey.

It is very similar to the closely related O. pulcher, but has five tibial spine pairs instead of four.

The species name domesticus is Latin for "home".