The 1933 All-Ireland Junior football championship was the 16th staging of the All-Ireland Junior Football Championship since its establishment by the GAA in 1912. Mayo won the 1933 competition.
The competition format saw the four provincial champions compete in two 'home' semi-finals, the winners of which then contested the All-Ireland 'home' final. The 'home final' was won by the Connacht champions, Mayo county football team, over the Ulster champions, the Donegal county football team, the latter making their first ever appearance in Croke Park and their first ever national final. The scoreline was Mayo 2-15 Donegal 2-2.
In the last stage of the competition, the victorious 'home' finalists then met the champions of Britain to determine who would be crowned overall All-Ireland Junior Football Champions. In this final, Mayo defeated London, the champions of Britain, on a scoreline of 3âÂÂ07 to 2-04.