Augustine Birrell KC was a British Liberal Party politician, who was Chief Secretary for Ireland from 1907 to 1916. In this post, he was praised for enabling tenant farmers to own their property, and for extending university education for Catholics. But he was criticised for failing to take action against the rebels before the Easter Rising, and resigned. A barrister by training, he was also an author, noted for humorous essays.

Augustus Hopkins Strong was a Baptist minister and theologian who lived in the United States during the late 19th and early 20th centuries. His most influential book, Systematic Theology, proved to be a mainstay of Baptist theological education.

Augustus Jessopp was an English cleric and writer. He spent periods of time as a schoolmaster and then later as a clergyman in Norfolk, England. He wrote regular articles for The Nineteenth Century, variously on humorous, polemical and historical topics. He published scholarly work on local Norfolk history and on aspects of English literature. A good friend of the academic and ghost-story writer M. R. James, he is described by James' biographer R. W. Pfaff as "a fine specimen of the learned but somewhat eccentric country parson."

Augustus Montague Toplady was an Anglican cleric and hymn writer. He was a major Calvinist opponent of John Wesley. He is best remembered as the author of the hymn "Rock of Ages". Three of his other hymns – "A Debtor to Mercy Alone", "Deathless Principle, Arise" and "Object of My First Desire" – are still occasionally sung today.

Aulus Cornelius Celsus was a Roman encyclopaedist, known for his extant medical work, De Medicina, which is believed to be the only surviving section of a much larger encyclopedia. The De Medicina is a primary source on diet, pharmacy, surgery and related fields, and it is one of the best sources concerning medical knowledge in the Roman world. The lost portions of his encyclopedia likely included volumes on agriculture, law, rhetoric, and military arts. He made contributions to the classification of human skin disorders in dermatology, such as myrmecia, and his name is often found in medical terminology regarding the skin, e.g., kerion celsi and area celsi. He is also the namesake of Paracelsus, a great Swiss alchemist and physician prevalent in the Medical Renaissance.

Sir Austen Henry Layard was an English Assyriologist, traveller, cuneiformist, art historian, draughtsman, collector, politician and diplomat. He was born to a mostly English family in Paris and largely raised in Italy. He is best known as the excavator of Nimrud and of Nineveh, where he uncovered a large proportion of the Assyrian palace reliefs known, and in 1851 the library of Ashurbanipal. Most of his finds are now in the British Museum. He made a large amount of money from his best-selling accounts of his excavations.

Austin C. Craig was an American historian born in Eddyton, New York. Being one of the first biographers of the Philippine national hero, José Rizal, a street was named after him in Sampaloc, Manila.

Austin Steward was an African-American abolitionist and author. He was born enslaved in Virginia then moved at age 7 with the Helm household to New York State in 1800. The household settled in the town of Bath, New York, in 1803. He escaped slavery at about age 21, settling in Rochester, New York, and then Canada. His autobiography, Twenty-Two Years a Slave, was published in 1857.

Ibn Rushd, often Latinized as Averroes, was an Andalusian polymath and jurist who wrote about many subjects, including philosophy, theology, medicine, astronomy, physics, psychology, mathematics, Islamic jurisprudence and law, and linguistics. The author of more than 100 books and treatises, his philosophical works include numerous commentaries on Aristotle, for which he was known in the Western world as The Commentator and Father of Rationalism.

Ibn Sina, commonly known in the West as Avicenna, was the preeminent philosopher and physician of the Muslim world, flourishing during the Islamic Golden Age, serving in the courts of various Iranian rulers. He is often described as the father of early modern medicine. His philosophy was of the Muslim Peripatetic school derived from Aristotelianism.