Tour de Montmart, Fortified tower in Besançon, France.

The Tour de Montmart is a square stone tower in Besançon, likely dating from the 13th century. Its light gray, roughly squared stone walls are partly covered by dense ivy climbing from near the base to just under the roofline. A steep pitched roof of reddish-brown tiles tops the tower, and a dark wooden double door sits at the bottom right of the ivy-covered front face. Two small barred windows are visible on the exposed stone sections.

The Tour de Montmart is probably a 13th-century gate tower, one of the two towers of a gate on the axis of rue Battant. Vauban kept it when he built the Battant bastion in the 17th century, using it as a store in the urban belt completed around 1688. It was classified as a monument historique on 8 June 1942.

The tower's name does not come from a family: it is also called tour Carrée, tour du Berger or tour du Cavalier de Battant, and it stood in the Battant district at the end of rue Battant. It is one of the two gate towers of the old Porte Battant, kept by Vauban as a storehouse within the Battant rampart finished around 1688.

The tower stands in the centre of the Battant bastion, the 17th-century outwork built by Vauban, in the Battant quarter on the right bank of the Doubs, a short walk from the city centre. It is reached on foot through the Battant streets; the tower itself is a vestige of the old gate and is seen from outside.

The tower is also called tour Carrée, tour du Berger or tour du Cavalier de Battant. It is the surviving remnant of one of the two gate-towers of the Porte Battant, which stood where the rue Battant continues; the second tower has not survived.