Whitaker's was a reference book, published annually in the United Kingdom. It was originally published by J. Whitaker & Sons from 1868 to 1997, next by HM Stationery Office until 2003 and then by A. & C. Black, which became a wholly owned subsidiary of Bloomsbury Publishing in 2011. The publication was acquired by Rebellion Publishing in 2020, with the 153rd edition appearing on 15 April 2021. In mid-2022, Rebellion announced that there would not be a 2022 edition and no further editions have appeared since then.
The almanack consisted of articles, lists, and tables on subjects such as education, the peerage, government departments, health and social issues, and the environment. It provided a directory of then-current countries, covering their recent history, politics, economy, and culture. Extensive astronomical data covering the forthcoming year were published at the rear of the book.