Mein Kampf (German: [maɪn ˈkampf]; lit. 'My Struggle') is a 1925 autobiographical manifesto by Nazi Party leader Adolf Hitler. The work describes the process by which Hitler became antisemitic and outlines his political ideology and future plans for Germany. Volume 1 of Mein Kampf was published in 1925 and Volume 2 in 1926. The book was edited first by Emil Maurice, then by Hitler's deputy Rudolf Hess.

Hitler began Mein Kampf while imprisoned following his failed coup in Munich in November 1923 and a trial in February 1924 for high treason, in which he received a sentence of five years. Although he received many visitors initially, he soon devoted himself entirely to the book. As he continued, he realized that it would have to be a two-volume work, with the first volume scheduled for release in early 1925. The governor of Landsberg noted at the time that "he [Hitler] hopes the book will run into many editions, thus enabling him to fulfill his financial obligations and to defray the expenses incurred at the time of his trial." After slow initial sales, the book became a bestseller in Germany following Hitler's rise to power in 1933.

After Hitler's death, copyright of Mein Kampf passed to the state government of Bavaria, which refused to allow any copying or printing of the book in Germany. In 2016, following the expiry of the copyright held by the Bavarian state government, Mein Kampf was republished in Germany for the first time since 1945, which prompted public debate and divided reactions from Jewish groups. A team of scholars from the Institute of Contemporary History in Munich published a German language two-volume almost 2,000-page edition annotated with about 3,500 notes. This was followed in 2021 by a 1,000-page French edition based on the German annotated version, with about twice as much commentary as text.