1964–65 was the fifty-second occasion on which the Lancashire Cup completion had been held.

St. Helens won the trophy by beating Swinton by the score of 12-4

The match was played at Central Park, Wigan, (historically in the county of Lancashire). The attendance was 17,383 and receipts were £3,393

This was the fifth of five consecutive Lancashire Cup final wins for St. Helens, and what is more, the fifth of seven victories in a period of nine successive seasons.
It is also the fourth time in the last five years that Swinton have been defeated finalists.

With again no invitation to a junior club this season, the total number of teams entering the competition remained the same at 14.

The same fixture format was retained, and due to the number of clubs this resulted in no bye but one “blank” or “dummy” fixture in the first round, and one bye in the second round

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1 * Central Park was the home ground of Wigan with a final capacity of 18,000, although the record attendance was 47,747 for Wigan v St Helens 27 March 1959

• 1964–65 Northern Rugby Football League season
• Rugby league county cups