Rodney 'Balls' Grinter (born 26 May 1965) is a former Australian rules footballer who played for Melbourne in the VFL and AFL. Grinter is most remembered for an incident in Round 2 of the 1988 VFL season when he punched Footscray defender Terry Wallace in the face, rendering Wallace unconscious. Both field umpires failed to report Grinter for the incident, but he received a six-week suspension for the incident after a VFL investigation. Later that season he appeared in Melbourne's losing Grand Final side against Hawthorn. He was also suspended for nine matches in 1990 following a number of incidents in a game against Richmond at the MCG.