The U-52 class was a class of four ocean-going submarines or U-boats planned for the Austro-Hungarian Navy () during World War I. The submarine design was based on the A 6 proposal submitted by Stabilimento Tecnico Triestino (STT) as part of a Navy design competition. STT, under its wartime name of Austriawerft, began construction on the first two boats in 1916, but neither boat was launched or completed before the end of the war. Both incomplete submarines were scrapped after the war ended. Neither of the third and fourth submarines was ever laid down.