The 1973–74 Lancashire Cup was the sixty-first occasion of the Lancashire Cup. Wigan won the trophy by beating Salford by the score of 19–9 in the final. The match was played at Wilderspool, Warrington. The attendance was 8,012 and receipts were £2,750.

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 decrease in the number of participating clubs, resulted in one "blank" or "dummy" fixtures in the first round, and one bye in the second round.

^[1][2]

1 * The John Player Yearbook 1974–75^[2] gives the score as 8-15 (4 goals to 3 converted tries) - The RUGBYLEAGUEproject ^[1] gives the score as 2-15
2 * The John Player Yearbook 1974–75^[2] gives the attendance as 8,522 (HT 7-4) - The RUGBYLEAGUEproject ^[1] gives the attendance as 8,556 - Other sources including the Rothmans Yearbook of 1991-92^[8] show it as 8,012
3 * Wilderspool was the home ground of Warrington from 1883 to the end of the 2003 Summer season when they moved into the new purpose built Halliwell Jones Stadium. Wilderspool remained as a sports/Ruugby League ground and is/was used by Woolston Rovers/Warrington Wizards junior club.
The ground had a final capacity of 9,000 although the record attendance was set in a Challenge cup third round match on 13 March 1948 when 34,304 spectators saw Warrington lose to Wigan 10-13.

• British rugby league system
• 1973–74 Northern Rugby Football League season
• Rugby league county cups
• List of defunct rugby league clubs