Division One South consisted of 22 clubs, including 17 clubs from the
previous season, and five new clubs: •
Crawley Down, promoted as champions of the
Sussex County League •
Croydon Athletic, relegated from the Premier Division •
Folkestone Invicta, relegated from the Premier Division •
Hythe Town, promoted as champions of the
Kent League •
Maidstone United, relegated from the Premier Division Croydon Athletic were deducted ten points for financial irregularities, and resigned from the league on 18 January 2012. Croydon's record of P19 W3 D3 L13 GF23 GA44 Pts2 was subsequently expunged. Whitehawk won Division One South and were promoted to the Premier Division for the first time in their history. Bognor Regis Town finished second for the second season in a row. After defeating Godalming Town in the semi-final, Bognor Regis Town gained revenge on their semifinal rivals from the previous year, Dulwich Hamlet, 1–0 and joined Whitehawk in the Premier Division. Dulwich Hamlet lost their second consecutive play-off final. Croydon Athletic resigned from the league in the middle of the season, so there was only one relegation place, taken by Whyteleafe.
League table Top scorers Play-offs Semi-finals Final Results grid Stadia and locations ==League Cup==