Operation Wieniec (, lit. Operation Corona) was one of the large-scale anti-Nazi operations of the Armia Krajowa during World War II that took place on the night from 7 to 8 October 1942. It targeted rail infrastructure near Warsaw. Similar operations aimed at disrupting German transport and communication in occupied Poland occurred in the coming months and years. It targeted railroads, bridges and supply depots, primarily near transport hubs such as Warsaw and Lublin.