The Fall 2016 season of the North American Halo Championship Series Open Circuit is an upcoming series of Halo 5: Guardianscompetition in the North American region, run by Pro Gaming League (PGL). The game is played in 4v4 competition in a series of online tournaments, in a season spanning from September 17th - November 20th, 2016. It is held concurrently with the Pro League.
- Weekly Open Cups split into Open Cup and Legendary Cup
- Legendary Cup consists of top 8 teams from previous week, plus top 8 teams from current week's Open Cup
- Points awarded based on placings over the season
- Teams permitted to make one roster change per week without losing points
- Top teams qualify for Open Circuit Finals
- Top 2 teams from Open Circuit Finals qualify for Relegation Event against bottom two Pro League teams