Mark Marnell (1926 - 9 July 1992) was an Irish hurler who played as a left corner-back for the Kilkenny senior team.

Born in Oldtown, Danesfort, County Kilkenny, Marnell first arrived on the inter-county scene when he first linked up with the Kilkenny senior team, making his debut in the 1947 championship.

Marnell was a regular member of the team over the next few years.

[citation needed] Marnell also represented the Leinster inter-provincial team, however, he never won a Railway Cup medal.

At club level he won one championship medal with Tullaroan.