Pachycondyla petrosa is an extinct species of ant in the formicid subfamily Ponerinae described from a fossil found in Europe.

The area is a preserved maar lake which initially formed approximately 47 million years ago as the result of volcanic explosions.

[2] At the time of description, the holotype specimen, number SMF MeI 12273 was preserved in the Senckenberg Research Station Messel fossil collections.

In the type description, Dlussky and Wedmann named the species P. petrosa, with the specific epithet derived from the Greek "petros", which means stone.

The alitrunk is 3.25 mm (0.128 in) long, with the ant being described as being very similar to members of the genus Mesoponera, formerly considered a subgenus of Pachycondyla.