| Michael J. O'Connor | |
| Office: | Member of the South Dakota House of Representatives |
| Term Start: | 1971 |
| Term Start2: | 1973 |
| Term End: | 1972 |
| Term End2: | 1977 |
| State Senate2: | South Dakota |
| District2: | 11th |
| Term Start3: | 1981 |
| Term End3: | 1982 |
| Birth Date: | 15 December 1928 |
| Birth Place: | Sioux Falls, South Dakota, U.S. |
| Death Place: | Sioux Falls, South Dakota, U.S. |
| Party: | Democratic |
| Spouse: | Barbara |
| Profession: | printing executive |
| Residence: | Brandon, South Dakota |
| Children: | four |
| Alma Mater: | Augustana University |
Michael J. O'Connor (December 15, 1928 – October 24, 2018) was an American politician in the state of South Dakota. He was a member of the South Dakota House of Representatives and South Dakota State Senate.[1] He was President Pro Tempore of the Senate from 1975 to 1976.
O'Connor was an alumnus of Augustana College and was a printing executive and owner of O'Connor Printers. O'Connor was a farmer. He served in the United States Marine Corps. O'Connor also served on the Minnehaha County Commission. O'Connor died at the Sioux Falls VA Hospital in Sioux Falls, South Dakota.[2] [3]