The Right Reverend Donald Hathaway Valentine Hallock (1908 – November 7, 1996) was the eighth Bishop of the Episcopal Diocese of Milwaukee. He was born in Menominee, Michigan and educated at the University of Wyoming and Nashotah House Theological Seminary.
He served as coadjutor bishop from 1952 to 1953 and as diocesan of Milwaukee from 1953 to 1973.