U12

U12 may refer to:

Submarines

 * GERMAN SUBMARINE U-12, various vessels
 * SMS U-12 (Austria-Hungary), a submarine of the Austro-Hungarian Navy

Other uses

 * U12 (Berlin U-Bahn), a former railway line
 * "U12" (song), a 2015 song by Daya
 * Nissan Bluebird (U12), a Japanese sedan
 * Nissan Pintara (U12), a Japanese sedan
 * Snub cube
 * U12 Consortium, a university alliance in Taiwan
 * U12 minor spliceosomal RNA
 * Udet U 12 Flamingo, a German biplane
 * BMW X1 (U12), a German crossover exclusively sold in China
 * Under-12, an age classification in many youth sports