George Patrick Ziemann (September 13, 1941 – October 22, 2009) was the third Roman Catholic bishop of the Roman Catholic Diocese of Santa Rosa in California.

On December 23, 1986, Pope John Paul II appointed Ziemann auxiliary bishop of the Los Angeles Archdiocese and he was consecrated on February 23, 1987, by then Archbishop Roger Mahony.

[2][3] On July 14, 1992, Pope John Paul II appointed Ziemann bishop of the Santa Rosa Diocese.

On July 22, 1999, Ziemann resigned due to sexual and financial improprieties.

This article about an American Catholic bishop or archbishop is a stub.