U17

U17 or U-17 may refer to:

Naval vessels

 * BRAZILIAN MONITOR Parnaíba
 * GERMAN SUBMARINE U-17, various vessels
 * SM U-17, a submarine of the Austro-Hungarian Navy

Other uses

 * Cessna U-17 Skywagon, an American utility aircraft
 * Nonconvex great rhombicuboctahedron