Séamus "Cheddar" Plunkett (born 1961) is an Irish former hurler who played as a full-forward for the senior Laois county team. Plunkett made his first appearance for the team during the 1980-81 National League and was a semi-regular member of the starting fifteen until he left the panel after the 1988 championship. During that time he had little success. At club level Plunkett is a seven-time county club championship medalist with Portlaoise.