The 1947–48 season was Colchester United's sixth season in their history and their sixth in the Southern League. Alongside competing in the Southern League, the club also participated in the FA Cup and Southern League Cup. The season was most notable for Colchester's run in the FA Cup, where they defeated three Football League clubs as they progressed to the fifth round, before being beaten 5–0 by First Division side Blackpool. They finished in 4th position in the Southern League, and while they ended as runners-up in the Southern League Cup, the final wasn't held until April 1949 due to fixture congestion.

Manager Ted Fenton's first-team squad had featured 28 part-time professionals during the 1946–47 season, but this number was reduced to 17 for the 1947–48 campaign, while signings such as Bob Allen and Harry Bearryman, and the emergence of Vic Keeble bolstered the ranks.

The 1947–48 season was most memorable for Colchester's magnificent run in the FA Cup. The competition began with a 3–2 win over league rivals Chelmsford City in the fourth qualifying round in front of a Layer Road crowd of 10,396. It was the second year in succession that the U's would reach the first round proper of the cup, having been defeated 5–0 by Reading at the same stage twelve months earlier. The result on this occasion would go in Colchester's favour, with 8,574 fans watching their 2–1 win against Banbury Spencer.

Third Division North side Wrexham visited Layer Road for the second round match, with the visitors falling to a 1–0 defeat courtesy of a Bob Curry goal in front of a 10,642 crowd. With the U's into the third round, it would be the club that inspired Colchester's own strip, Huddersfield Town of the First Division, that would taste defeat at the hands of the non-Leaguers. With the national press making Colchester's Cup progress headline news, Fenton welcomed the extra publicity. He watched Huddersfield play a number of times prior to the tie, declaring to the media that he had come up with a plan to beat them. The plan became known as "the F-plan". Both teams changed colours for the game, with visiting Huddersfield in red, and Colchester in blue. The First Division side struggled to adapt to the cramped surroundings of Layer Road, and when Bob Allen's free kick was parried away by the goalkeeper, U's captain Bob Curry scored from the rebound. This was the first time that a non-League side had beaten a First Division club, with a record crowd of 16,005 witnessing that game.

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