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.