Leo Rosten (1908-1997) was an American humorist.
Rosten was born in Lodz, to Jewish parents, who emigrated to the United States when he was three years old, where he grew up bilingual in Yiddish and English. Rosten was the creator of the fictional English language learner Hyman Kaplan and author of various short stories. He partly based these on his own experience of teaching English as a second language during the Great Depression.
He was also a successful scriptwriter.