Samuel Mullen (27 November 1828 – 29 May 1890) was an Irish-born bookseller, active in Australia. Mullen was born in Dublin, Ireland, the son of George Mullen, a bookseller, and his wife Eliza, née Orson. Mullen was educated at Nuttgrove College and later at Trinity College, Dublin. At age 16, Mullen was indentured to an apothecary, but did not like the work. In 1844 Mullen was apprenticed to William Curry and Company Booksellers and some time afterwards went to England and joined the firm of Parker and Company.