The 2012–13 Trinidad and Tobago Cup was the 83rd season of the FA Trophy, which is the oldest football competition for teams in Trinidad and Tobago. Caledonia AIA entered as the tournament's defending champion, who defeated Defence Force 1–0 in the 2011–12 final at Manny Ramjohn Stadium. The tournament began on 5 December 2012 with 36 teams competing in single elimination matches and concluded on 1 March 2013 with the crowning of the cup winners.

The tournament features teams from the top three levels of the football pyramid. These three levels and 9 leagues, namely the TT Pro League, National Super League, Central FA's Premier Division, Eastern FA's Premier Division, Eastern Counties' Football Union, Northern FA's Premier Division, Southern FA's Premier Division, Tobago FA's Premier Division, and the Secondary School Football League each have their own separate qualification process to trim their ranks down to their final team delegations.

All eight teams from the TT Pro League entered the competition. The top six following the 2012 National Super League season also met qualification. In addition, all six regional football associations were awarded three qualification positions and four teams qualified from the Secondary Schools Football League.

The following clubs qualified for the 83rd edition of the FA Trophy:

Eastern FA – Premier Division

Eastern Counties – Football Union

Southern FA – Premier Division

Tobago FA – Premier Division

The schedule for the 2012–13 FA Trophy, as announced by the Trinidad and Tobago Football Association:

All matches were played over two 45 minute halves, and in the process if the match were drawn at the end of regulation time, then two additional 15-minute halves were used, and if necessary, penalty kicks if still drawn after extra time.

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