Onania: or, the heinous sin of self-pollution

Onania, or the Heinous Sin of Self-Pollution, and All Its Frightful Consequences, in Both Sexes, Considered, With Spiritual and Physical Advice for Those Who Have Already Injur'd Themselves by This Abominable Practice, often referred to by its shortened title: Onania: or, the heinous sin of self-pollution, or simply Onania, is a pamphlet opposing masturbation. Its date of first publication is thought to be around 1712–1716 and copies are known to have been printed in London in 1723. The identity of its author is unknown; it has been variously attributed to the English surgeon John Marten, and to a "Dr. Bekkers".

By 1730, there had been fifteen revised editions of the book by which time around 15,000 copies of the pamphlet had been printed. It experienced international popularity, being translated into Dutch and German. It was a best-seller of its time, selling tens of thousands of copies.