Mario Majeroni (1870–1931) was an Italian-born American playwright and stage and film actor.

Majeroni came to the United States in 1906 and started acting on Broadway that year.

Prior to coming to the United States he had lived and worked in Australia, where his parents[1] had a successful dramatic company[2] noted for one of the earliest stage adaptations of For the Term of His Natural Life.

[3] In 1914 he started appearing in silent films after years of stage work.

Majeroni never appeared in sound films and preferred Broadway plays to talkies.