Gustave Jean-Jacques Saintenoy (° Brussels 6-2-1832, † Schaerbeek 17-1-1892) was a Belgian Architect.
He married into the Cluysenaar family of Architects. In 1861 he married Adèle-Clothilde Cluysenaar (° 31-8-1834, † 15-8-1901). They had one son born in 1862 named Paul, who became too a famous architect. After his death he was buried in Schaerbeek Cemetery.
He was a student at the Académie Royale des Beaux-Arts in Brussels. In 1866 he became the titular architect of the Count of Flanders. HE built important buildings in royal command like Palace of the Count of Flanders and the Royal castle of Amerois.