| Jon O'Brien | |
| Fullname: | Jonathan Mark O'Brien |
| Birth Date: | 1961 11, df=y |
| Birth Place: | Southend-on-Sea, England |
| Position: | Goalkeeper |
| Years1: | 1982–1983 |
| Clubs1: | Maldon Town |
| Years2: | 1983–1984 |
| Clubs2: | Tilbury |
| Years3: | 1984–1986 |
| Clubs3: | Southend United |
| Caps3: | 11 |
| Goals3: | 0 |
| Years4: | 1986–1988 |
| Clubs4: | Chelmsford City |
| Years5: | 1988–1990 |
| Clubs5: | Dartford |
| Years6: | 1990–1992 |
| Clubs6: | Barking |
| Years7: | 1992–1994 |
| Clubs7: | Hitchin Town |
| Years8: | 1988–1990 |
| Clubs8: | Wivenhoe Town |
| Caps8: | 59 |
| Goals8: | 0 |
| Years9: | 1991–1992 |
| Clubs9: | Wivenhoe Town |
| Caps9: | 5 |
| Goals9: | 0 |
| Years10: | 2006 |
| Clubs10: | Great Wakering Rovers |
Jonathan Mark O'Brien (born 2 November 1961) is an English former footballer who played as a goalkeeper.
In 1984, O'Brien signed for hometown club Southend United on non-contract terms, after playing for Maldon Town and Tilbury. After new manager Bobby Moore was appointed Southend manager, O'Brien was invited to train with the first team. On 10 November 1984, O'Brien made his Southend debut in a 2–1 home victory against Peterborough United.[1] Following another ten Football League appearances for Southend, O'Brien dropped back into non-league, playing for Chelmsford City, Dartford, Barking, Hitchin Town, Wivenhoe Town and Great Wakering Rovers.[2]