What genre of righting was OHenry?

O. Henry is most closely associated with the genre of short story. He is often described as a master of the "surprise ending" and is known for his witty, ironic, and often sentimental stories, which often focus on the lives of ordinary people in New York City.

While some consider his work to be realism due to its focus on everyday life, others categorize it as romanticism due to its themes of redemption and hope. Ultimately, O. Henry's writing transcends simple genre classifications and holds a unique place in American literature.