Mompha bradleyi is a moth in the Momphidae family. It found in western and central Europe and has been recorded from Great Britain, France, the Netherlands, Germany, the Czech Republic, Austria, Hungary, Slovakia, Poland, Romania and Belarus. The wingspan is 9–11 millimetres (0.35–0.43 in). Adults are on wing from mid July to the end of May of the following year after overwintering. There is one generation per year. The larvae feed on Epilobium hirsutum. The larvae feed inside the stem of their host plant. Feeding causes a conspicuous red gall to be formed.