'''Oliver St John Gogarty''' (August 17, 1878-September 22, 1957) was an Irish poet and writer best known as the inspiration for Buck Mulligan in James Joyce's encylopedic novel Ulysses. Born in Dublin, Gogarty was a medical student and joker who wrote humorous verse and stories. He had a strained relationship with Joyce that ended with Joyce leaving Ireland; Gogarty claimed a gun was inovled.

One of his best known bits of verse, The Ballad of Japing Jesus, was quoted in the first chapter of Ulysses. He died in New York City.