The Hansa-Brandenburg W.13 was a flying boat bomber developed in Germany in 1917 and used by the Austro-Hungarian Navy during World War I.

The W.13 was a largely conventional design for the time, with a single-step hull and an engine mounted pusher-fashion on struts in the interplane gap.

The interplane struts were unusual in that on each side of the aircraft, the upper and lower wings were braced with two pairs of struts that converged from two sets of attachment points on the upper wing to a single set on the lower wing, so that when viewed from fore or aft, the struts formed a V-shape.

It was, however, accepted by the Austro-Hungarian Navy, which operated it from bases on the Adriatic Sea during the Italian Campaign.

In service, the Austro-Daimler engine caused continuous problems, which the manufacturer attributed to the poor lubricating oil available at the front.