Cassiobury Rangers Pumas Under-15s added the Watford Friendly League Red Division title to their Challenge Cup victory to complete a memorable double.
Rangers, who have been managed by Steve Schmid for the past six seasons, ended their league campaign 11 points ahead of second placed side Harvesters.
Their 2-0 win over Alexander Park in the Challenge Cup final ensured the club recorded their third successive victory in the competition.
Schmid said: "The boys have been a credit to the club. They always having a desire to improve whilst playing the game in the right spirit."
The side's stand-out result this season was a 3-3 draw against Luton Town Academy's Under-15 side.
Cassiobury Rangers are an FA Charter Standard Development Club and are recruiting players from Under-6 to Under-18s age groups.
For more information, visit www.cassioburyrangersfc.co.uk