William (Wilhelm) Finnemann (December 18, 1882 – October 26, 1942) was a priest of the Society of the Divine Word, auxiliary bishop of Manila and apostolic vicar of Calapan, the Philippines.

Born in Büninghausen, Soest, North Rhine-Westphalia in the German Empire, to Bernhard and Elizabeth Nasse.

[2] The pastor of the Hultrop, Dr. Bernhard Köper, invited him to study in a Latin Catholic public school, where he proved a good student.

With the outbreak of World War I, in 1918 he was taken into protective custody by the Americans and brought to the USA, winding up at the Society's St. Mary's Mission Seminary in Techny, Illinois where he remained for some years.

Finnemann also became Vicar General of the Curia Eclesiastica and Administrator of Obras Pias at the Archbishop's Palace.

Once out in the deep waters between Calapan and Batangas, he was bound and thrown overboard because he refused to turn over to the Japanese army a convent of the Holy Spirit Sisters for use for as a brothel.