1938–39 was the thirty-first occasion on which the Lancashire Cup completion was held.
Wigan won the trophy by beating Salford by a score of 10-7.
The match was played at Station Road, Pendlebury, Salford, (historically in the county of Lancashire).
The number of teams entering this year's competition remained the same at 13, and the same fixture format was retained.
[1] Round 1 involved six matches (with one bye and one "blank" fixture) and 13 clubs.