Sources used: Padraig Ferguson’s Archive, Wikipedia, The Road to 51
There is no record of Mayo having taken part in the inaugural year of the NFL.
FIRST ROUND: Mayo 2-6 Sligo 1-3 (Castlerea, 30/5/1926). MAYO: D Creagh; F Shouldice, B Durkan, J Gallagher; P O’Beirne, F Doherty (1-1), M Mullins; M Mulderrig, J Forde; T Forde, J McGahern, F Patten (1-0); J Henry, JE McEllin (0-2), J White. [Three points unattributed]
SEMI-FINAL: Mayo 2-3 Leitrim 0-2 (Showgrounds, Sligo, 13/6/1926). Mayo scorers: JE McEllin (1-0), J White (0-1), M Mullins (0-1). [Two points unattributed. Team details unavailable.]
FINAL: Galway 3-2 Mayo 1-2 (Roscommon, 11/7/1926). MAYO (incomplete team): J Forde (0-2), J Patten, M Mullins, J McGahern, M Mulderrig, P O’Beirne, JE McEllin, J White, F O’Doherty. [Goal attributed. According to The Road to 51, both sides objected to the result, with Central Council ruling in Galway’s favour.]
The NFL did not take place in the 1926/7 season.