Fort Constantine

Fort Constantine, Fort Konstantin, Fort Constantin, or Fort Grand Duke Constantine may refer to:


 * Fort Konstantin (Germany), Koblenz, Germany
 * Fort Constantin (Russia), Kronstadt, Russia
 * Konstantin Battery or Fort Constantine, built in Sevastopol, Ukraine in 1840
 * Fort Constantine (Yukon) near Forty Mile, Yukon
 * Fort Constantine, Canadian ship of the Fort ship type
 * RFA Fort Constantine, a Royal Fleet Auxiliary ship