The 1905 Lancashire Cup was the inaugural year for the rugby league Lancashire Cup competition. The cup was won by Wigan who beat Leigh in a replay at Wheater's Field, Broughton, Salford by a score of 8-0. The attendance was 10,000 and receipts £200. The initial final (which had taken place 9 days earlier at the same venue) had ended in a 0-0 draw before a crowd estimated at 16.000 and receipts of £400.