| Michael J. O'Brien | |
| Office: | Member of the Iowa House of Representatives |
| Term Start: | January 11, 1993 |
| Term End: | January 12, 2003 |
| Birth Date: | 4 May 1939 |
| Birth Place: | Shenandoah, Iowa, United States |
| Party: | Democrat |
| Occupation: | teacher |
| Spouse: | Ronna |
| Children: | eight |
Michael J. O'Brien (born May 4, 1939) is an American politician in the state of Iowa.
O'Brien was born in Shenandoah, Iowa. He attended Iowa State University and the University of Northern Iowa and was a teacher. A Democrat, he served in the Iowa House of Representatives from 1993 to 2003 (79th district).[1]