The SIAI-Marchetti S.211 (later Aermacchi S-211) is a turbofan-powered military trainer aircraft designed and originally marketed by Italian aviation manufacturer SIAI-Marchetti.
SIAI-Marchetti started to develop the S-211 in 1976 as a private venture initiative, announcing its existence during the following year. In April 1981, the first prototype performed its maiden flight. The Philippine Air Force placed the first order for fifty aircraft in 1983. Some 62 aircraft have been sold to air forces around the world. Following Aermacchi's purchase of SIAI-Marchetti in 1997, the former has held the production rights to the type. An extensively redesigned and modernized derivative, the Aermacchi M-345, has been developed by Alenia Aermacchi, and entered service in 2020.
