奥托·爱德华·利奥波德·冯·俾斯麦（德语：Otto Eduard Leopold von Bismarck，1815年4月1日－1898年7月30日），劳恩堡公爵，普鲁士王国首相（1862年－1890年），德意志帝国首任宰相，人称「铁血宰相」（德语：Eiserner Kanzler；「铁」指武器，「血」指战争）、「德国的建筑师」及「德国的领航员」。奉行「铁血政策」。但他在1871年德国统一后，对外收敛锋芒，强调自己不过是「诚实经纪人」（或翻成「诚实仲介人」）。

俾斯麦是十九世纪德国最卓越的政治家，担任普鲁士首相期间通过一系列铁血战争统一德意志，并成为德意志帝国第一任宰相（又译“帝国总理”）。俾斯麦是保守派，维护专制主义，镇压了19世纪80年代的社会民主主义运动；但他通过立法，创建了世界上最早的工人养老金、健康和医疗保险制度，及社会保险。由于其对德国统一的贡献，加上卓越及伟大成就，俾斯麦最后获升任为德意志帝国陆军上将。在2005年德国电视二台票选最伟大的德国人活动中，他排名第九，次于第八伟大的印刷术发明者约翰内斯·古腾堡。

Otto Eduard Leopold, Prince of Bismarck, Duke of Lauenburg (1 April 1815 – 30 July 1898), known as Otto von Bismarck, was a conservative Prussian statesman who dominated German and European affairs from the 1860s until 1890. In the 1860s he engineered a series of wars that unified the German states, significantly and deliberately excluding Austria, into a powerful German Empire under Prussian leadership. With that accomplished by 1871 he skillfully used balance of power diplomacy to preserve German hegemony in a Europe which, despite many disputes and war scares, remained at peace. For historian Eric Hobsbawm, it was Bismarck who "remained undisputed world champion at the game of multilateral diplomatic chess for almost twenty years after 1871, [and] devoted himself exclusively, and successfully, to maintaining peace between the powers."