The 1976–77 Player's No.6 Trophy was a British rugby league knockout tournament. It was the sixth season that the competition was staged, which was once again known as the Player's No.6 Trophy because of its sponsorship.

Castleford won the final, beating Second Division side Blackpool Borough by the score of 25–15. The match was played at The Willows, Salford. The attendance was 4,512 and receipts were £2,919.

This season saw no changes in the entrants, no new members and no withdrawals, the number remaining at thirty-two. For the second season there were no drawn matches in the competition.^[1][2][3]

1 * Ovenden are a Junior (amateur) club from Halifax
2 * Ovenden were drawn at home but chose to give away home advantage
3 * Ace Caravans were a Junior (amateur) club from Hull
4 * Ace Caravans were drawn at home but chose to give away home advantage
5 * The Rothmans Yearbooks 1990-91^[12] and 1991-92^[13] gave the attendance as 3,037 but The News of the World/Empire News annual 1977–78^[2] gave it as 3,680
6 * The News of the World/Empire News annual 1977–78^[2] gives the score as 13-25 but other sources including RUGBYLEAGUEprojects,^[1] Wigan official archives^[3] give the score as 13-28
7 * Wigan's centre (No. 4) Bill Francis & York's second-row (No. 11) Gary Hetherington were both sent off for fighting in the 78th Minute
8 * Wigan official website^[10] states incorrectly that the match date was Saturday 27 November
9 * The Willows was the home ground of Salford with a final capacity of 11,363 which included 2,500 seats. The record attendance was 26,470 on the 13 February 1937 in the Challenge Cup first round match vs Warr

• 1976–77 Northern Rugby Football League season
• 1976 Lancashire Cup
• 1976 Yorkshire Cup
• Player's No.6 Trophy
• Rugby league county cups