梅什科二世 （Mieszko II，约990年－1034年）。皮雅斯特王朝的波兰国王（1025年－1031年；1032年－1034年）。波列斯瓦夫一世（勇敢者）之子。

梅什科二世的统治受到企图独立的大贵族与外国强权的挑战。波希米亚、匈牙利和德国人相继入侵。匈牙利国王伊什特万一世从梅什科二世手里夺取了斯洛伐克（1027年）；神圣罗马帝国皇帝康拉德二世则夺取了上卢日策（1031年）。丹麦也趁机侵入波美拉尼亚。1031年，梅什科二世的兄弟贝斯普里姆夺走了他的王位。

在波希米亚公爵奥尔德日赫帮助下，梅什科二世在1032年恢复了王位，但他不得不放弃波美拉尼亚和西里西亚。

Mieszko II Lambert ( Polish ; c. 990 – 10/11 May 1034) was King of Poland from 1025–1031, and Duke from 1032 until his death.

He was the second son of Bolesław I Chrobry (the Brave) but the eldest born from his third wife Emmilda, daughter of Dobromir, possible ruler of Lusatia. He was probably named after his paternal grandfather, Mieszko I. His second name, Lambert, sometimes erroneously considered to be a nickname, was given to him as a reference to the cult of Saint Lambert. Also, it is probable that this name Lambert was chosen after Bolesław Chrobry's half-brother Lambert. It is thought that the choice of this name for his son was an expression of warming relations between Bolesław Chrobry and his stepmother Oda.