Michael Ryan Patrick Dempsey (September 10, 1918 – January 8, 1974) was an American Catholic prelate who served as an auxiliary bishop of the Archdiocese of Chicago from 1968 to 1974.
Before his appointment to the episcopacy, Father Dempsey was instrumental in creating the Catholic Campaign for Human Development.
The principal co-consecrators were Bishops Ernest John Primeau of Manchester and Cletus F. O'Donnell of Madison.
He continued to serve as an auxiliary bishop until his death from a heart attack on January 8, 1974.
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