Caryocolum fraternella is a moth of the Gelechiidae family. It is found in Ireland, Great Britain, Fennoscandia, Denmark, Germany, the Netherlands, France, Switzerland, Spain, Latvia, Estonia and Ukraine. The wingspan is 10–13 mm. Adults are on wing from July to August. The larvae feed on Stellaria species (including Stellaria uliginosa and Stellaria graminea) and Cerastium fontanum. They feed in the terminal shoots of their host plant.