Cathy O'Brien (born July 19, 1967 in Janesville, Wisconsin) is a retired female long-distance runner from the United States. She set her personal best (2:29:38) in the women's marathon in 1991 while winning the Los Angeles Marathon. She is married to Michael O'Brien and has two kids, Patrick Finbar O'Brien born April 2, 1999 and Andrew Joseph O'Brien. Cathy is now a violin teacher and she runs every day. She Currently lives in Durham, New Hampshire.
| Year | Competition | Venue | Position | Notes |
|---|---|---|---|---|
| Representing United States | ||||
| 1988 | Olympic Games | Seoul, South Korea | 40th | 2:41:04 |
| 1991 | Los Angeles Marathon | Los Angeles, United States | 1st | 2:29:38 |
| 1992 | Olympic Games | Barcelona, Spain | 10th | 2:39:42 |