Caryocolum petryi is a moth of the family Gelechiidae. 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 4âÂÂ7 mm for males and 4âÂÂ6 mm for females. Adults have been recorded on wing from late June to early September.