The Right Honourable (abbreviation: The Rt Hon. or variations) is an honorific style traditionally applied to certain persons and collective bodies in the United Kingdom, the former British Empire, and the Commonwealth of Nations. The term is predominantly used today as a style associated with the holding of certain senior public offices in the United Kingdom, Canada, New Zealand, and, to a lesser extent, Australia.

Right in this context is an adverb meaning 'very' or 'fully'. Grammatically, The Right Honourable is an adjectival phrase which gives information about a person. As such, it is not considered correct to apply it in direct address, nor to use it on its own as a title in place of a name; but rather it is used in the third person along with a name or noun to be modified.

Right may be abbreviated to Rt, and Honourable to Hon., or both. The is sometimes dropped in written abbreviated form, but is always pronounced.

According to the British government, the following persons are entitled to be styled Right Honourable:

Privy counsellors are appointed by the sovereign on the advice of the prime minister, and remain members for life unless they resign or are expelled. In practice, membership of the privy council is granted to:

A large proportion of the former and current prominent politicians of the United Kingdom are thus entitled to be styled Right Honourable.

No new appointments have been made to the Privy Council of Northern Ireland since 1971, but surviving appointed members remain entitled to the style. Non-British Commonwealth-citizen judges appointed to the Judicial Committee of the Privy Council are also entitled to the style, although the appellation may be ignored in the judge's home country.

It is the current practice of the House of Lords and the College of Arms to apply the style Right Honourable to privy counsellors only.