Koscielny, currently out with an ankle injury, captained the side in place of Per Mertesacker last season.
Mertesacker retired from playing at the end of the campaign, assuming the role of Arsenal’s academy manager.
Ahead of Emery’s Premier League bow at home to Manchester City on Sunday, the Spaniard has also named four vice-captains; Ozil , Petr Cech, Aaron Ramsey, and Granit Xhaka – one of whom will take the armband in Koscielny’s absence.
On the appointments, Emery said:
“The captain of this group is Laurent Koscielny, who is injured at the moment. After Laurent, our other captains are Petr Cech, Aaron Ramsey, Mesut Ozil, and Granit Xhaka.