Isabelle Boizeau (née Billaud; born 18 November 1905) is a French supercentenarian whose age is currently unverified by an international validating authority.
Isabelle was born on 18 November 1905 in Saint-Martin-des-Champs, Yonne, France. She came to Châlette-sur-Loing after marriage. She is the widow of Louis Gabriel Charles Jean Boizeau. They had two children, twins, a boy and a girl.
Isabelle lives in Montargis, Loiret, France.