(10 January 1877 – 7 February 1950) was a Benedictine monk and Roman Catholic bishop who served as apostolic administrator of Hamheung, Korea and Abbot of Tokugen o Tokwon.

On 4 February 1900, he made Solemn Profession in the Order of Saint Benedict and was ordained a priest on 26 July 1903.

On 25 August 1920, Sauer was appointed vicar apostolic of Wonsan, Korea and Titular Bishop of Appiaria.

[2] On 9 July 1928, Sauer was appointed the apostolic administrator of Ilan, China.

Six years later, on 15 February 1934, he resigned as apostolic administrator of Ilan, China.