The German chancellor during World War II was Adolf Hitler. He led Nazi Germany from 1933 until his death in 1945, promoting a totalitarian regime marked by extreme nationalism, militarism, and anti-Semitism. Under his leadership, Germany invaded multiple European countries, precipitating the outbreak of World War II in 1939. Hitler's aggressive expansionist policies and the implementation of genocidal practices, particularly the Holocaust, caused immense suffering and loss of life. His regime ended with Germany's defeat in May 1945, after which Hitler committed suicide as Allied forces closed in on Berlin.