Sigismund Felix Freiherr von Ow-Felldorf

Sigismund Felix Freiherr von Ow-Felldorf (18 October 1855, Berchtesgaden – 11 May 1936, Passau) was a German clergyman who served as the 80th Bishop of Passau from 1907 until his death in 1936.

He was ordained a priest on 25 July 1884 by Bishop Ignatius von Senestrey, and was a parish priest in Regensburg, Germany.

On 11 January 1902, aged 46, he was appointed an Auxiliary Bishop of Regensburg, and a month later he was named Titular Bishop of Arethusa. On 18 October 1906, aged 51, he was appointed Bishop of Passau and installed in March 1907. He remained in post until his death on 11 May 1936, aged 80.

He was a priest for 51 years and a bishop for 34 years.