German submarine U-1009 was a Type VIIC/41 U-boat of Nazi Germany's Kriegsmarine during World War II.

She was ordered on 23 March 1942, and was laid down on 24 February 1943, at Blohm & Voss, Hamburg, as yard number 209.

She was launched on 5 January 1944, and commissioned under the command of Oberleutnant zur See Klaus Hilgendorf on 10 February 1944.

The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two BBC GG UB 720/8 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged.

Of the 156 U-boats that eventually surrendered to the Allied forces at the end of the war, U-1009 was one of 116 selected to take part in Operation Deadlight.