The Macchi M.12 was a biplane flying boat bomber designed by Alessandro Tonini, and produced in small numbers by Macchi in Italy in 1918.

[1] The M.12 had a conventional design, generally similar to an enlarged version of other Macchi designs of the period, and featured the Warren truss-style interplane struts that had been introduced on the Macchi M.9.

[2] A major difference however, was its twin-boom fuselage,[1] each with a separate tailfin.

The M.12bis was a civil variant with five seats and a wingspan extended to 18 m (59 ft), intended to carry passengers and mail.

[3] Data from Jane's All the World's Aircraft 1919, 391General characteristics Performance