西普鲁士省（德语：Provinz Westpreußen; 波兰语：Prusy Zachodnie）是1773－1824年及1878－1918年间普鲁士的一个省分。1918年后，该省的中部成为了波兰走廊和但泽自由市，而其余仍是魏玛共和国的领土则成为了波森-西普鲁士和位于东普鲁士的西普鲁士地区。

除了这两段时间西普鲁士作为一个省分存在之外，「西普鲁士」一词在13世纪开始，至1945年亦是中欧历史地区的名称，历史上这地区是普鲁士人居住的地方，之后的多个世纪德国人、斯洛温人、卡舒比人、雨格诺派教徒、波兰人、门诺派教徒、苏格兰人等相继迁入。

The Province of West Prussia (German:Provinz Westpreußen; Kashubian:Zôpadné Prësë; Polish:Prusy Zachodnie) was a province of the Kingdom of Prussia from 1773–1824 and from 1878–1919/20, within the German Reich, which was created out of the earlier Polish province of Royal Prussia. In February 1920, Germany (after it had been defeated in 1918) handed over West Prussia's mainly German populated central parts to become the so-called Polish Corridor (i.e. Pomeranian Voivodeship) and the Free City of Danzig, while the parts remaining with the German Weimar Republic became the new Posen-West Prussia or were joined to the Province of East Prussia as Regierungsbezirk West Prussia. The territory was included within Reichsgau Danzig-West Prussia from 1939–45, after which it became part of Poland.