彭忒西勒亚（古希腊语：Πενθεσίλεια；英语：Penthesilea）是希腊神话中的一位亚马逊女王。

根据《伊里亚特》的说法，彭忒西勒亚是战神阿瑞斯的女儿。在一次打猎中，她用标枪掷向一只梅花鹿，却误中了自己的妹妹希波吕忒，因此受到复仇女神厄里倪厄斯的追逐和诅咒。特洛伊战争爆发后，彭忒西勒亚得知厄里倪厄斯喜欢远征，希望借机摆脱困境，便率领十二名亚马逊女战士支持特洛伊。

当时特洛伊失去了英雄赫克托耳，亚马逊人的到来给予了特洛伊人新的希望。彭忒西勒亚受到特洛伊王普里阿摩斯极高规格的款待。第二天，彭忒西勒亚率领亚马逊战士非常英勇地杀入希腊人的军中，迫使希腊人节节败退。她指明要与希腊英雄阿奇里斯单挑，却被阿奇里斯刺死。阿奇里斯脱去她的头盔之后，为其美貌所震惊，心中十分悲伤。希腊人将彭忒西勒亚的尸体归还给特洛伊人，特洛伊人将其火葬。

Penthesilea (Greek:Πενθεσίλεια) or Penthesileia was an Amazonian queen in Greek mythology, the daughter of Ares and Otrera and the sister of Hippolyta, Antiope and Melanippe. Quintus Smyrnaeus explains more fully than pseudo-Apollodorus how Penthesilea came to be at Troy: Penthesilea had killed Hippolyta with a spear when they were hunting deer; this accident caused Penthesilea so much grief that she wished only to die, but, as a warrior and an Amazon, she had to do so honorably and in battle. She therefore was easily convinced to join in the Trojan War, fighting on the side of Troy's defenders.