The Stinson Junior was a high-winged American monoplane of the late 1920s, built for private owners, and was one of the first such designs to feature a fully enclosed cabin.

[1] The SM-1 was sold successfully to airlines and other commercial operators, but it was too large to appeal to private owners.

The aircraft was a strut-braced high-wing monoplane with a sturdy outrigger undercarriage which was braced against the wing support struts and the initial 110 h.p.

[2] The design was further developed to produce the more powerful and heavier SM-7 and SM-8 models which were full four-seaters and these were also used by commercial firms.

The various Stinson Junior models were in production between 1928 and 1933, being bought by both wealthy private flyers and commercial enterprises.