Jean Dionis du Séjour (born 21 September 1956, in Agen, Lot-et-Garonne), is a French politician from the former centrist UDF party. He is now member of the New Centre (NC).
Deputy of the first Lot-et-Garonne constituency from 2002 to 2012, he was elected mayor of Agen during the 2008 municipal election.[1]