1965–66 Hellenic Football League

The 1965–66 Hellenic Football League season was the 13th in the history of the Hellenic Football League, a football competition in England.

Premier Division
The Premier Division featured 16 clubs which competed in the division last season, along with two new clubs, promoted from Division One:
 * Thatcham
 * Waddesdon

Division One
The Division One featured 12 clubs which competed in the division last season, along with 4 new club:
 * Henley Town, relegated from the Premier Division
 * Hungerford Town, relegated from the Premier Division
 * Aston Clinton
 * Buckingham Athletic