Caryocolum petryi is a moth of the Gelechiidae family. It is found in France, Germany, Austria, Switzerland, Italy, Slovenia, former Yugoslavia, Hungary, Latvia, Lithuania, Sweden and Finland. It is also found in Mongolia and Siberia (Tuva). The length of the forewings is 4–7 mm for males and 4–6 mm for females. The forewings are grey, dark brown or sometimes black, becoming orange-brown at the dorsal margin, across the wing near the base and in the middle. Adults have been recorded on wing from late June to early September.