Caliadurgus fasciatellus is a species of spider wasp from the subfamily Pepsinae found from Western Europe to the Far East of Asia.

The name Caliadurgus was proposed originally by Pate in 1946 as a replacement for a preoccupied name, Calicurgus, published by Lepeletier in 1845.

The 1st and 2nd segments of the abdomen are brownish red with white spurs in the middle and hind legs.

In Europe found from Great Britain east to Russia and Finland south to Spain and the Balkans.

The prey is gripped in the jaws, between the thorax and abdomen, and transported to the burrow by being carried in front of the wasp.