破城者（希腊语：ἑλέπολις , Helepolis），是一超巨型攻城器具。由色萨利的波吕伊多斯（Polyidus）所发明，后来经过马其顿安提柯王朝德米特里一世和雅典的埃披马格斯（Epimachus）改良而成，用在前305年罗得围城战中。

破城者攻城塔是由前一年萨拉米斯围城战中的攻城塔为基础，发展而成。它的希腊原名ελείν πόλεις，即「破坏城市者」。古代作家如西西里的狄奥多罗斯、维特鲁威、普鲁塔克等，以及古书阿特纳奥斯的《设备》（Athenaeus Mechanicus）对这项惊人的攻城塔都有详细的描述。假如这些数据都是正确的话。那破城者攻城塔将是古代历史上最巨大、且最有威力的攻城塔。

Helepolis (Greek:ἑλέπολις, English: "Taker of Cities") is the Greek name for a movable siege tower. The most famous one was the siege engine invented by Polyidus of Thessaly and improved by Demetrius I of Macedon and Epimachus of Athens for the unsuccessful Siege of Rhodes (305 BC), based on an earlier design used against Salamis (306 BC). It was neither the first nor the largest helepolis. According to W. Murray, the earliest helepolis was constructed by Polyadis for Philip II of Macedon in 340 BC for the siege of Perinthus. The largest recorded helepolis was used by the same Demetrius in the siege of Salamis in Cyprus in 306 BC. The name was derived from "ελείν πόλεις", meaning taking or capturing cities. Descriptions of it were written by Diodorus Siculus, Vitruvius, Plutarch, and in the Athenaeus Mechanicus.