The 1st constituency of the Yonne is a French legislative constituency in the Yonne département.

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1st constituency of Yonne
Constituency of the National Assembly of France
Yonne's 1st Constituency shown within Burgundy
Deputy	Daniel Grenon RN
Department	Yonne
Cantons	Aillant-sur-Tholon, Auxerre-Est, Auxerre-Nord, Auxerre-Nord-Ouest, Auxerre-Sud, Auxerre-Sud-Ouest, Bléneau, Charny, Coulanges-la-Vineuse, Courson-les-Carrières, Saint-Fargeau, Saint-Sauveur-en-Puisaye, Toucy, (part) Seignelay (Part)
Registered voters	78,334
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Yonne's 1st Constituency covers the south west of the department and includes its prefecture Auxerre.

Since 1988, the constituency has never returned left-of-centre candidates to the Assembly.

Between 1981 and 2012, the deputy was Jean-Pierre Soisson. Soisson was mayor of Auxerre between 1971 and 1998. He became a minister between 1988 and 1993, as part of president Mitterrand ouverture efforts, to include centre-right politicians in his left-wing governments.

In 2012, Soisson retired and the election was a close call between Guy Férez, the socialist mayor of Auxerre, and Guillaume Larrivé, an advisor to various ministers and the president Nicolas Sarkozy between 2005 and 2012. Larrivé was reelected in 2017 against Paulo Da Silva Moreira, the candidate from La République en marche, president Emmanuel Macron's party.

In 2022, Larrivé is eliminated in the first round of the election and the second round is decided between Florence Loury, a green candidate supported by the left-wing NUPES alliance, and Daniel Grenon, the far-right National Rally candidate. The latter is elected by a slim margin of 729 votes.