The 1977 Amco Cup was the 4th edition of the NSWRFL Midweek Cup, a NSWRFL-organised national club Rugby League tournament between the leading clubs and representative teams from the NSWRFL, the BRL, the CRL, the QRL, the NZRL, Western Australia and the Northern Territory.
A total of 37 teams from across Australia and New Zealand played 36 matches in a straight knock-out format, with the matches being held midweek during the premiership season.