John Prentiss Poe Sr. (August 22, 1836 – October 14, 1909) was Attorney General of the State of Maryland from 1891 to 1895. He was born in Baltimore, the son of Neilson Poe and wife Josephine Emily Clemm. Poe was a second cousin once removed of the poet Edgar Allan Poe as well as a nephew through his mother. John Poe Sr. was a lawyer as well as a leading member of the Maryland Democratic Party, and served as Dean of the University of Maryland School of Law. He died in Ruxton, Baltimore County, on October 14, 1909, and was buried in Baltimore's Green Mount Cemetery.