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

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.

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

[1] The holotype worker is approximately 7.5 mm (0.30 in) with a slender mesosoma, weakly rounded pronotum and a thick petiole node.

The head has oval compound eyes that are placed towards the back end and are small compared to other Formica species.