The 32-year-old back-rower has made 28 appearances for the Perpignan-based side after joining from South Sydney.
He will make his final home Super League appearance for the Dragons at the Stade Gilbert Brutus against Castleford on Saturday.
Stewart previously spent 12 seasons with Manly Sea Eagles.
Catalans Dragons have released former Australia international forward Glenn Stewart just one year into his three-year contract for family reasons.