The King's English is a book about how to use English correctly, including grammar and style. It was written by Henry Watson Fowler and Francis George Fowler and published in 1906. This book came out twenty years before Modern English Usage, which was written by Henry Fowler alone after Francis died in 1918.

The King's English is more like a guidebook than a dictionary. It has longer sections on general topics, such as vocabulary, sentence structure, and punctuation. It uses many examples from different sources. One part of the book explains the proper use of shall and will. The third and final edition was published in 1931, by which time Modern English Usage had become more popular.

Languages change over time, so some parts of The King's English are now seen as outdated. Some of the Fowlers' ideas about correct English are considered old-fashioned, though not wrong, by today’s standards. For example, the Fowlers did not like the word concision because it had a special meaning in theology, which they thought should stay in that field. However, concision is now commonly used to mean conciseness. The Fowlers also criticized words like standpoint and phrases like just how much (as in "Just how much more of this can we take?"), calling them "Americanisms." These are now common in British English. Despite this, the book is still respected as a standard reference and is still available for purchase.

The Queen's English is a similar book written by Harry Blamires. It was published in 1994 and later reprinted as Correcting your English in 1996.