Václav Kosmák (5 September 1843, Martínkov – 15 March 1898, Prosiměřice) was a Czech novelist, humorist and satirist.

Kosmák was a priest as well as a writer. Notable for his realism and humor, Kosmák's short stories sketch the provincial life of Moravia. His collected works were published in 1883–1884; a second, more complete edition was published after his death. Notable of his works include Kukátko z kukátek, Jak Martin Chlubil bloudil a na pravou cestu opět se vrátil and Pokoj lidem dobre vůle. The Roman Catholic church where he was a priest, in Martínkov, outside of Prague, bears a monument in remembrance of his contribution to church, community, and the public. His writings were until recently required reading in many Czech schools.