Rosenau may refer to various places in Europe:
in Austria: Rosenau am Hengstpaß, Upper Austria a hamlet near Seewalchen am Attersee, Upper Austria the boroughs Rosenau Markt and Rosenau Schloss in Zwettl, Lower Austria Schloss Rosenau, Zwettl, a castle near Zwettl
in Germany: Rosenau, Brandenburg, in the district of Potsdam-Mittelmark, Brandenburg Schloss Rosenau, Coburg, a castle in Rödental, Bavaria a borough of Grafenau, Bavaria a borough of Engelskirchen, North Rhine-Westphalia a borough of Langenpreising, Bavaria Rosenau (Königsberg), a former quarter of Königsberg, Prussia
in France: Rosenau, Haut-Rhin, a commune in the region of Grand Est
Rosenau is the German name of:
Râşnov, Romania Rožnov pod Radhoštěm, Czech Republic Rožňava, Slovakia Zilupe, Latvia Jastrzębowo, Poland
Rosenau is a surname. Notable people with the surname include:
James N. Rosenau (1924–2011), American political scientist and international affairs scholar Milton J. Rosenau (1869–1946), American public health official and professor William Rosenau (1865-1943), Leader of Reform Judaism