At the 2017 Longford Senior Football Championship ( All 12 teams entered the competition at this stage, Groups A and B each consisted of 4 seeded teams (the previous year's quarter-finalists) with 3 teams from each group progressing to the Quarter-Finals).
All 12 teams entered the competition at this stage. Groups A and B each consisted of 4 seeded teams (the previous year's quarter-finalists) with 3 teams from each group progressing to the Quarter-Finals. 
