Friedrich Gustav Emil Martin Niemöller (14 January 1892 – 6 March 1984) was a prominent German anti-Nazi theologian and Lutheran pastor. He is best known as the author of the poem First they came....

Although he was a national conservative and initially a supporter of Adolf Hitler, he became one of the founders of the Confessing Church, which opposed the nazification of German Protestant churches. He vehemently opposed the Nazis' Aryan Paragraph, but made remarks about Jews that some scholars have called antisemitic. For his opposition to the Nazis' state control of the churches, Niemöller was imprisoned in Sachsenhausen and Dachau concentration camps from 1937 to 1945.

He narrowly escaped execution and survived imprisonment. After his imprisonment, he expressed his deep regret about not having done enough to help the victims of the Nazis. He turned away from his earlier nationalistic beliefs and was one of the initiators of the Stuttgart Declaration of Guilt. From the 1950s on, he was a vocal pacifist and anti-war activist, and vice-chair of War Resisters' International from 1966 to 1972. He met with Ho Chi Minh during the Vietnam War and was a committed campaigner for nuclear disarmament.

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