Andrew M. Greeley (born February 5, 1928 in Oak Park, Illinois, to Andrew and Grace Greeley) is an Irish-American Roman Catholic priest, sociologist, journalist and best selling author.

Greeley is Professor of Sociology at the University of Arizona and is a Research Associate with the National Opinion Research Center (NORC) at the University of Chicago. He writes a weekly column for the Chicago Sun-Times and contributes regularly to The New York Times, the National Catholic Reporter, America, and Commonweal. He has given numerous interviews on both radio and television.

After studies at Archbishop Quigley Preparatory Seminary in Chicago, he received an AB from St. Mary of the Lake Seminary in Chicago in 1950, an STB in 1952, and an STL in 1954, when he was ordained. From 1954 to 1964 he served as an assistant pastor at Christ the King parish in Chicago, during which time he studied sociology at the University of Chicago. He received a Master of Arts in 1961 and then a PhD in 1962. His doctoral dissertation dealt with the influence of religion on the career plans of 1961 college graduates.