U11 may refer to:

Naval vessels

* * , various vessels * , a sloop of the Royal Navy * , a submarine of the Austro-Hungarian Navy

Other uses

* U11 (Berlin U-Bahn), a planned transit line * U11 (Nuremberg U-Bahn), a discontinued transit line * BMW X1 (U11), a German crossover * HTC U11, a smartphone * Nissan Bluebird (U11), a Japanese sedan * Truncated cuboctahedron * U11 spliceosomal RNA * Udet U 11 Kondor, a German prototype airliner * Uppland Runic Inscription 11 {{disambiguation