Memoirs of the Twentieth Century is an early work of speculative fiction by Irish writer Samuel Madden. This 1733 epistolary novel takes the form of a series of diplomatic letters written in 1997 and 1998. The work is a satire perhaps modeled after Jonathan Swift's Gulliver's Travels published seven years before. Madden was an Anglican clergyman, and the book is focused on the dangers of Catholicism and Jesuits, depicting a future where they dominate.