Debrett's (/dəˈbrɛts/[1]) is a British professional coaching company and publisher and authority on etiquette and behaviour,[2] founded in 1769 with the publication of the first edition of The New Peerage.

John Debrett (8 January 1753 – 15 November 1822) was the London-born son of Jean Louys de Bret, a French cook of Huguenot extraction and his wife Rachel Panchaud.

[3] By 1790 he had passed the editorship on to John Debrett who, in 1802, put his name to the two small volumes that made up The Correct Peerage of England, Scotland and Ireland.

Debrett's Peerage & Baronetage, a book which includes a short history of the family of each titleholder,[6] was previously published roughly every five years.

[12] The selection of entrants was made by the editorial staff of Debrett's and entries were reviewed annually to ensure accuracy and relevance.

[17] Its courses for businesses cover topics such as public speaking, networking, sales pitches, relationship management, personal presentation and dress codes.

[18] Its private client courses focus on confidence-building and social competence, as well as personal presentation and impact, career progression and digital networking.

[21] In the opening pages of Jane Austen's Persuasion (1818), the vain and snobbish Sir Walter Elliot loves to look at his own family's entry in Debrett's.

In Noël Coward's song "The Stately Homes of England" (from 1938 musical Operette), four British noblemen sing: "Reading in Debrett of us, / This fine patrician quartette of us, / We can feel extremely proud.