Servant of God Joseph Müller (19 August 1894 – 11 September 1944) was a German Catholic priest and critic of the Nazi regime. He was tried by the "People's Court" and executed at Brandenburg-Görden Prison.
Müller was born in Salmünster, Hesse, the youngest of seven children of the local cantor and teacher Damien Müller and his wife Augusta. After obtaining his Abitur degree, he served as a volunteer in World War I, interrupted by a serious injury. After the war he resolved to become a preacher; two of his brothers also were ordained Catholic priests. He went on to study theology at the University of Münster and proceeded with his brother Oskar to the Diocese of Hildesheim. Both attended the Hildesheim seminary from 1921 and received the holy orders from Bishop Joseph Ernst in the following year.
Joseph Müller began his ecclesiastical career as a chaplain in Duderstadt. In 1924 he joined the Franciscan convent at Fulda, but later continued to work as chaplain in Gehrden, Hannoversch Münden, Celle, and Wolfenbüttel. In 1931 he was installed as a priest in Bad Lauterberg. From 1934 he served as a priest in Süpplingen, from October 1937 in Heiningen. Due to his deteriorated health, he served in the small Catholic parish of Groß Düngen from 1 August 1943 onwards.