The season began on 20 February 2013 for the S.League, 1 March 2013 for the Prime League and 27 April 2013 for the NFL First, Second and Third Divisions.
Teams relegated from NFL Division 1 Teams promoted to NFL Division 1 Teams relegated from NFL Division 2 Teams promoted to NFL Division 2 Following Radojko Avramović's resignation after Singapore's victory in the 2012 AFF Suzuki Cup, LionsXII coach V Sundramoorthy was announced as the stand-in head coach while the FAS searched for a new coach to fill the vacancy.
[5] The Singapore Olympic Foundation - Peter Lim Charity Cup was an exhibition fundraising match between the Singapore Selection and 2013 Copa del Rey winners, Atlético Madrid.
[6] The match was held at the Jalan Besar Stadium on 22 May 2013 and Atlético Madrid prevailed with a 2-0 scoreline with goals coming from Raúl García and Diego Costa.
Singapore was represented in the 2013 AFC Cup by 2012 S.League champions Tampines Rovers and 2012 Singapore Cup winners Warriors F.C.