John Wiley & Sons, Inc., commonly known as Wiley (/ˈwaɪli/), is an American multinational publishing company which focuses on academic publishing and instructional materials. The company was founded in 1807 and produces books, journals, and encyclopedias, in print and electronically, as well as online products and services, training materials, and educational materials for undergraduate, graduate, and continuing education students.

The company was established in 1807 when Charles Wiley opened a print shop in Manhattan. The company was the publisher of 19th century American literary figures like James Fenimore Cooper, Washington Irving, Herman Melville, and Edgar Allan Poe, as well as of legal, religious, and other non-fiction titles. The firm took its current name in 1865. Wiley later shifted its focus to scientific, technical, and engineering subject areas, abandoning its literary interests.

Wiley's son John (born in Flatbush in Brooklyn, New York on October 4, 1808; died in East Orange, New Jersey on February 21, 1891) took over the business when Charles Wiley died in 1826. The firm was successively named Wiley, Lane & Co., next Wiley & Putnam, and then John Wiley. The company acquired its present name in 1876, when John's second son William H. Wiley joined his brother Charles in the business. Through the 20th century, the company expanded its publishing activities, the sciences, and higher education.

In 1960 Wiley set up a European branch in London, which later moved to Chichester, England. In 1982, Wiley acquired the publishing operations of the British firm Heyden & Son. In 1989, Wiley acquired the life science publisher Liss. In 1996, Wiley acquired the German technical publisher VCH.

In 1997, Wiley acquired the professional publisher Van Nostrand Reinhold (the successor to the company started by David Van Nostrand) from Thomson Learning. In 1999, Wiley acquired the professional publisher Jossey-Bass from Pearson.

In 2001, Wiley acquired the publisher Hungry Minds (formerly IDG Books, including most titles formerly published by Macmillan General Reference) from International Data Group. In 2005, Wiley acquired the British medical publisher Whurr.

Wiley marked its bicentennial in 2007. In conjunction with the anniversary, the company published Knowledge for Generations: Wiley and the Global Publishing Industry, 1807–2007, depicting Wiley's role in the evolution of publishing against a social, cultural, and economic backdrop. Wiley has also created an online community called Wiley Living History, offering excerpts from Knowledge for Generations and a forum for visitors and Wiley employees to post their comments and anecdotes. In 2021, Wiley acquired Hindawi and J&J Editorial.

In 2023, Academic Partnerships acquired Wiley's online education business for $150 million.