Alexander Smallens (January 1, 1889 – November 24, 1972) was a Russian-born American conductor and music director.

[1] Smallens was born in Saint Petersburg, Russia, and emigrated to the United States as a child, becoming an American citizen in 1919.

In addition, Smallens worked briefly on Broadway, conducting the premieres of Thomson's Four Saints in Three Acts in 1934 and Gershwin's Porgy and Bess the next year.

Smallens also conducted orchestras for music as part of several documentary films in the late 1930s and early 1940s.

In 1924, Smallens was involved in an affair with composer Marc Blitzstein during a trip the two took in Europe; this was the latter's first relationship.