John O'Kane Murray (December 12, 1847-July 30, 1885) was a noted physician and author. He was born in County Antrim, Ireland, in 1847. He came with his family to the United States in 1856. He attended St. John's College (now Fordham University), and became a physician. He also wrote several books, including books on church history, hagiography, Irish poetry, English literature, and history. He died in Chicago in 1885.