Samuel Austin Allibone (April 17, 1816 – September 2, 1889) was an American author, librarian, and bibliographer, best known for his monumental reference works, including 'A Critical Dictionary of English Literature' and 'A Dictionary of English Literature and British and American Authors.' Born in Philadelphia, he was largely self-educated and developed a passion for literary and bibliographical studies. He worked at the Library Company of Philadelphia and later served as librarian for the American Bible Society. Allibone's works provided systematic indexing and critical annotations for thousands of authors, making him a key figure in 19th-century English literary scholarship. His contributions remain valued in the history of bibliography.