Posthumous Fragments of Margaret Nicholson was a collection of poetry published in November 1810 by Percy Bysshe Shelley and his friend Thomas Jefferson Hogg while they were students at Oxford University. The pamphlet was subtitled: "Being Poems found amongst the Papers of that Noted Female who attempted the Life of the King in 1786. Edited by John Fitzvictor." The pamphlet was published by John Munday and Henry Slatter in Oxford and consisted of fictional fragments that were in the nature of a hoax and prank or burlesque.