Rev. John Allen Giles (1808–1884) was an English historian. He was primarily known as a scholar of Anglo-Saxon language and history. He revised Stevens' translation of the Anglo-Saxon Chronicle and Bede's Ecclesiastical History of the English People. He was a fellow at Corpus Christi College, Oxford.
The son of William Giles and his wife Sophia, née Allen, he was born on 26 October 1808 at Southwick House, in the parish of Mark, Somerset. At the age of sixteen he entered Charterhouse School as a Somerset scholar. From Charterhouse he was elected to a Bath and Wells scholarship at Corpus Christi College, Oxford, on 26 November 1824. In Easter term 1828 he obtained a double first class, and shortly afterwards graduated B.A., proceeding M.A. in 1831, in which year he gained the Vinerian scholarship, and took his D.C.L. degree in 1838. His election to a fellowship at Corpus on 15 November 1832 followed his college scholarship as a matter of course.
Giles wished to become a barrister, but was persuaded by his mother to take orders, and was ordained to the curacy of Cossington, Somerset. The following year he vacated his fellowship, and was married. In 1834 he was appointed to the head-mastership of Camberwell College School, and on 24 November 1836 was elected head-master of the City of London School. The school did not do well under him, and he resigned on 23 January 1840; his resignation, however, has also been attributed to some misfortune connected with building speculations. He was succeeded by George Ferris Whidborne Mortimer. He retired to a house which he built near Bagshot, and there took pupils, and wrote.
After a few years Giles became curate of Bampton, Oxfordshire, where he continued taking pupils, and edited and wrote a great number of books. Among them was one entitled Christian Records, published in 1854, which related to the age and authenticity of the books of the New Testament. Samuel Wilberforce as bishop of Oxford, required him, on pain of losing his curacy, to suppress this work, and break off with another literary. After some letters, which were published, he complied with the bishop's demand.