Formica paleosibirica is an extinct species of formicid in the ant subfamily Formicinae known from fossils found in eastern Asia.

[1] The specimens were described from compression fossils preserved in diatomite deposits of the Bol’shaya Svetlovodnaya site.

Located in the Pozharsky District, on the Pacific Coast of Russia, the fossil-bearing rocks preserve possibly Priabonian plants and animals which lived in a small lake near a volcano.

In the type description, Dlussky, Rasnitsyn and Perfilieva named the species F. paleosibirica, with the specific epithet derived from the Greek palaios, meaning "ancient" plus "Siberia" referring to the origin of the fossils.

At the time of description the authors noted that it was not possible to tell if the F. paleosibirica males and the Formica biamoensis workers described in the same paper were separate species.