The 1950–51 Lancashire Cup was the thirty-eighth occasion on which the RFL Lancashire Cup competition had been held.

Wigan won the trophy by beating Warrington by the score of 28–5

The match was played at Station Road, Pendlebury, (historically in the county of Lancashire). The attendance was 42,541 and receipts were £6,222.

The attendance was a new record for the Lancashire Cup final and would only ever be broken once in the future

This was the fifth of Wigan's record breaking run of six consecutive Lancashire Cup victories.

Overall, the number of teams entering this year's competition remained the same as last year's total of 14.

The same pre-war fixture format was retained. This season saw no bye but one "blank" or "dummy" fixture in the first round. There was also one bye but no "blank" fixture" in the second round.

As last season, all the first round matches of the competition will be played on the basis of two legged, home and away, ties – and the remainder of the rounds remaining on straight forward knock-out basis.

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1 * The attendance of 42,541 was a new record for the Lancashire Cup final beating the previous by just over 3,500, and would only ever be broken once in the future

2 * Station Road was the home ground of Swinton from 1929 to 1932 and at its peak was one of the finest rugby league grounds in the country and it boasted a capacity of 60,000. The actual record attendance was for the Challenge Cup semi-final on 7 April 1951 when 44,621 watched Wigan beat Warrington 3–2

• 1950–51 Northern Rugby Football League season
• Rugby league county cups