1978–79 was the sixty-sixth occasion on which the Lancashire Cup completion had been held.

Widnes won the trophy by beating Workington Town by the score of 15-13

The match was played at Central Park, Wigan, (historically in the county of Lancashire). The attendance was 10,020 and receipts were £6,261.00

After relatively little success in the competition, Workington Town had reached the semi-final stage in 1973, 1974 and 1975, had been runner-up in 1976, winner in 1977, and now runners-up again in 1978. They would go on to be runners-up again in 1979.

The total number of teams entering the competition remained at last season’s total of 14 with no junior/amateur clubs taking part.

The same fixture format was retained, but due to the number of participating clubs, this resulted in 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

• 1978–79 Northern Rugby Football League season
• Rugby league county cups