Marn Grook (also spelt marngrook), literally meaning "Game ball", is a collective name given to a number of traditional Indigenous Australian recreational pastimes believed to have been played at gatherings and celebrations of up to 50 players. It is often confused with a separate indigenous game resembling Association Football known as Woggabaliri. Woggabaliri is recognised by the Australian Sports Commission as the earliest depicted indigenous ball game and is believed to be the subject of William Blandowski's engraving "never let the ball hit the ground" (see picture on right).

Generally speaking observers commented that Marn Grook was a football game which featured Punt kicking and catching a stuffed "ball". It involved large numbers of players, and games were played over an extremely large area. Totemic teams may have been formed, however to observers the game appeared to lack a team objective, having no real rules, scoring or winner. Individual players who consistently exhibited outstanding skills, such as leaping high over others to catch the ball, were often commented on.