Siege of Nicaea (disambiguation)

Siege of Nicaea may refer to:
 * Siege of Nicaea (727), part of the Arab–Byzantine Wars
 * Siege of Nicaea (1097), part of the First Crusade
 * Siege of Nicaea (1113), part of the Byzantine–Seljuk Wars
 * Siege of Nicaea (1331), part of the Byzantine–Ottoman Wars