| Code: | Hurling |
| Sport: | Hurling |
| John Marnell | |
| Irish: | Seán Ó Mearnáil |
| Feet: | 6 |
| Inches: | 0 |
| Occupation: | Psychiatric nurse |
| County: | Kilkenny |
| Province: | Leinster |
| Club: | Dicksboro |
| Clcounty: | 1 |
| Counties: | Kilkenny |
| Icposition: | Left corner-back |
| Icyears: | 1975-1983 |
| Icprovince: | 1 |
| Icallireland: | 1 |
| Nhl: | 0 |
| Allstars: | 0 |
| Icupdate: | 22:47 12 September 2012 |
| Birth Date: | 1956 |
| Birth Place: | Kilkenny, Ireland |
John Marnell (born 1956) is an Irish retired hurler who played as a left corner-back for the Kilkenny senior team.
Marnell joined the team during the 1975-76 National League and was a member of the team at various intervals for much of the next decade. An All-Ireland medalist in the minor, under-21 and junior grades, he won one All-Ireland winners' medal at senior level as a non-playing substitute.[1]
At club level Marnell is a one-time county club championship medalist with played with Dicksboro.