Augustyn Träger (born August 25, 1896 in Kalnica Dolna - died, April 22, 1957 in Bydgoszcz), codenames Sęk (Knot) and Tragarz (Moving Man), was a Polish-Austrian soldier during World War I and an intelligence officer in interwar and German-occupied Poland. Along with his son, Roman Träger, he played an important role in obtaining intelligence on the German V-1 and V-2 missiles which were being tested on the island of Usedom in Pomerania. He passed the information along to the Polish resistance organization Home Army, which then in turn passed it on to the Allies in London. This led to the Allied bombing of Peenemünde in Operation Hydra in 1943.