What is the difference between King's English and Queen's English?

They are the same. While a king reigns, it is the King's English. While a queen reigns, it is the Queen's English

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The monarch of England is sometimes a king and sometimes a queen (at the present time, March 2013, it is Queen Elizabeth II) but the English language does not change; it is the monarch's English. We just use different terms to reflect the identity of the reigning monarch.

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The expression "the queen's English" refers to the reigning British monarch. Since English currently has a queen, and has for almost 60 years, the proper expression is "the queen's English."

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I suppose when Charles becomes king, the expression might change to "the king's English."

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ACTUALLY, the expression "The King's English" refers to a title of a book written by the Fowler brothers in 1906, which deals with the English language, its pronunciation, etc. A book's title does not change just because a monarch changes. Therefore, it is "The King's English", regardless of whether the current monarch is male or female.

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