波兰共和国众议院（波兰语：Sejm Rzeczypospolitej Polskiej，亦称色姆，是波兰议会的下议院，现任议长是拉多斯瓦夫·西科尔斯基。

在20世纪前，词语“Sejm”指的是由三大议院组成的整个波兰议会，包括下院（波兰语：Izba Poselska）、上院（波兰语：Senat）以及国王，是称呼三大阶层国会的常用名词。然而随着波兰第二共和国（1918年－1939年）的创建，“Sejm”一词开始被用于专指国会下院；而上院则被称为“Senat”。

The Sejm of the Republic of Poland ([sɛjm]; Polish:Sejm Rzeczypospolitej Polskiej) is the lower house of the Polish parliament. It consists of 460 deputies (posłowie, literally "envoys", in Polish) elected by universal ballot and is presided over by a speaker called the "Marshal of the Sejm of the Republic of Poland" (Marszałek Sejmu Rzeczypospolitej Polskiej). In the Kingdom of Poland, "Sejm" referred to the entire three-chamber parliament of Poland, comprising the lower house (the Chamber of Envoys; Polish:Izba Poselska), the upper house (the Senate; Polish: Senat) and the King. It was thus a three-estate parliament. Since the Second Polish Republic (1918–1939), "Sejm" has referred only to the lower house of the parliament; the upper house is called the Senat Rzeczypospolitej Polskiej ("Senate of the Republic of Poland").