Zenas Winsor McCay (c. 1866–71 – July 26, 1934) was an American cartoonist and animator.

He is best known for the comic strip Little Nemo (1905–14; 1924–26) and the animated film Gertie the Dinosaur (1914). For contractual reasons, he worked under the pen name Silas on the comic strip Dream of the Rarebit Fiend. McCay was an early animation pioneer; between 1911 and 1921 he self-financed and animated ten films, some of which survive only as fragments.