The 1958 Rugby League Lancashire Cup competition 1958–59 was the forty-sixth occasion on which the Lancashire Cup completion had been held.Oldham won the trophy by beating St. Helens by the score of 12-2The match was played at Station Road, Pendlebury, (historically in the county of Lancashire). The attendance was 38,780 and receipts were £6,933; another excellent attendance.This was the third (and final one) of Oldham's three consecutive triumphs. It would be the last time they would win the trophy, although they did later appear 4 times as runners-up (in 1966, 1969, 1987 and 1989).