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In Australian rules football, the 50-metre arc is one of the arcs that exist at each end of the ground, 50m from the goal line. On AFL grounds, the arcs are coloured (blue at one end, and red at the other) with a thinner white edge, and are broken twice at the flanks with a number 50 pained in each gap; on suburban grounds, the arcs are simply white and unlabelled.

The 50-metre arc was introduced during the 1980s, in order to give players, umpires and spectators a better idea of the distance from goal. It gives an indication of the average distance from which most players would be capable of scoring. When introduced, each 50-metre arc was coupled with a smaller, 25-metre arc. However, all players are capable of kicking well over 25 metres; as such, the arcs provided no benefit to spectators, and they quickly disappeared from grounds.

The arcs obtained significance for the first time in Wizard Cup competitions in 2003, with two relevant rule changes. Firstly, a goal scored from outside the arc (known as a "super goal") was worth 9 points, rather than the usual 6 points. To claim the supergoal, the kicker must be completely behind the arc; this has led to some contentious judgement calls when the player kicks from on top of the painted 50, where the arc is broken.

The second rule stated that a mark taken from a backwards kick would be called play-on, unless taken within the 50-metre arc. This rule was introduced into regular-season VFL for the 2006 season, with the intention of trialling it as a possible remedy to the so-called "chip-chip" style of play. Whether or not it will be adopted into the AFL in this form remains to be seen; in the 2007 NAB Cup, the AFL trialled the same rule at the halfway point of the ground instead of the 50-metre arc.

In 2005, the length of the centre square was increased from 45m to 50m; as a result, the 50-metre arcs intersected the centre square at the notoriously small Sydney Cricket Ground. To remedy the situation, the curators painted 45-metre arcs instead of 50-metre arcs. After statisticians argued that the inside-50 statistic could no longer be accurately collected, the 50-metre arcs were reinstated; the portion of the arcs that overlap the centre square are not painted onto the field, which will again cause difficulties if the super goal is ever introduced into the regular season.

• Laws of Australian football

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