James Pettit Andrews (1737– 6 August 1797) was an English historian and antiquary.
He was the younger son of Joseph Andrews of Shaw House, near Newbury in Berkshire. He was educated privately, and having taken to the law was one of the magistrates at the police court in Queen Square, Westminster, from 1792 to his death.
Andrews built himself the Strawberry Hill Gothic mansion of Donnington Grove, near the family home, in 1763. He developed a taste for literature, and his miscellaneous works include The Savages of Europe (London, 1764), a satire on the English which he translated from the French, and Anecdotes Ancient and Modern (London, 1789), an amusing collection of gossip. His chief work was a History of Great Britain connected with the Chronology of Europe from Caesar's Invasion to Accession of Edward VI, in 2 volumes (London, 1794–1795). Its plan is somewhat singular, as a portion of the history of England is given on one page, and a general sketch of the contemporaneous history of Europe on the opposite page. He also wrote a History of Great Britain from Death of Henry VIII to Accession of James VI of Scotland – a continuation of Robert Henry's History of Great Britain, which left off at the death of Henry VIII – published in 1796 and again in 1806. Andrews died at Brompton and was buried in Hampstead Church. He married Anne, daughter of Thomas Penrose, rector of Newbury.
He was a regular participant in the Committee for the Relief of the Black Poor in the 1780s.