Oskar Luts (January 7, 1887 [O.S. December 26, 1886] – March 23, 1953) was an Estonian writer and playwright.

Born into a middle-class family in Järvepera, central Estonia, at that time in the governorate of Livonia (Russian Empire). His younger brother was the film director and cinematographer Theodor Luts. Oskar Luts attended Änkküla village school in 1894. He went to Palamuse Parish parish school in Jõgeva County, attending from 1895–1899. In 1899–1902 he studied at the Tartu Reaalkool. In 1903, Luts started working as an apothecary apprentice in Tartu and Narva. After passing the apothecary apprentice exams, he went to work in Tallinn (1903). During his military service in Saint Petersburg (1909–1911) he also worked in the apothecary field. He continued this work in Dorpat while studying pharmacy at university.