Russell Edward Jacobus (September 27, 1944 - October 24, 2023) was the seventh Bishop of the Diocese of Fond du Lac in The Episcopal Church.

Jacobus was ordained Deacon in February 1970 and to the Priesthood in August 1970 by Donald Hathaway Valentine Hallock, VIII Bishop of Milwaukee.

Jacobus married Jerrie Ellen Evrard on 25 May 1968; they are the parents of three adult children: Penny, Elizabeth, and David.

He is currently a member of Communion Partners, an Episcopalian group which opposed the 77th General Episcopal Convention's decision to authorize the blessing of same-sex marriages in 2012.

He has always been involved in and supportive of Ecumenical ventures, serving on the Anglican/Roman Catholic Dialogue Committee, and assisting the Churches of Greater Waukesha to develop programs of outreach to the needy.