Andrew Horn (c. 1275–1328) was a fishmonger of Bridge Street, London, lawyer and legal scholar. He served as Chamberlain of the City of London from 1320 until his death in 1328. Sir William Blackstone's Commentaries on the Laws of England describe Horn as "one of the most learned lawyers of his day".
Horn is best known for his book Liber Horn, compiled in 1311. Besides coroners' reports and other mundane matters, Liber Horn contains some of the earliest and most reliable versions of early English laws, including certain Statutes of uncertain date and an annotated copy of the Magna Carta of 1297. Horn is also thought to have compiled and edited La somme appelle Mirroir des justices: vel Speculum justiciariorum (translated variously as The Mirror of Justices or The Mirror of Justice).
As a legal scholar, Andrew Horn's literary achievements consisted largely of compiling, editing, transcribing, and annotating statutes, pipe rolls, chronicles, and other official documents. This has resulted in a problem of attribution, since it is not always clear to what extent he acted as author or editor.
- Liber Horn.
- Mirroir des Justices (Mirror of Justices).
- A continuation of Leges Anglorum.
- Liber legum regum antiquorum.
- A narrative of the London eyre of 1321.
- Annales Londonienses.
- Andrew Horn (1642), La somme appelle Mirroir des iustices: vel Speculum Iusticiariorum, Factum per Andream Horne, London: Printed by E[dward] G[riffin] for Matthew Walbanke and Richard Best and are to be sold at their shops at Grayes Inne Gate, OCLC 84157087.
- Lee, Sidney, ed. (1891). "Horn, Andrew". Dictionary of National Biography. 27. London: Smith, Elder & Co.
- Corporation of London; Riley, Henry Thomas (1868). Memorials of London. Longmans, Green and Co. p. 116. Retrieved 10 February 2012.
- Blackstone, Sir William; Tucker, St. George (1996). Blackstone's commentaries. The Lawbook Exchange, Ltd. p. 59. ISBN 978-1-886363-16-8. Retrieved 12 February 2012.
- Sharpe, Reginald Robinson; City of London (England). Court of Common Council. Library Committee (1913). Calendar of coroners rolls of the city of London, A.D. 1300-1378. R. Clay and Sons. p. 5. Retrieved 8 February 2012.
- Plucknett, Theodore Frank Thomas (2001). A concise history of the common law. The Lawbook Exchange, Ltd. p. 267. ISBN 978-1-58477-137-1. Retrieved 10 February 2012.
- The Mirror of Justice
- Sir Frederick Pollock; Alfred Edward Randall (1897). The Law quarterly review. Stevens and Sons. pp. 85–103. Retrieved 10 February 2012.
- Cook, John Douglas; Harwood, Philip; Pollock, Walter Herries; Harris, Frank; Hodge, Harold (1861). The Saturday review of politics, literature, science and art. John W. Parker and Son. p. 196. Retrieved 10 February 2012.