The 1977 World Junior Ice Hockey Championships (1977 WJHC) were held between December 22, 1976 and January 2, 1977 in Banská Bystrica and Zvolen, Czechoslovakia. The Soviet team won the tournament with a perfect 7–0 record. This was the fourth edition of the IIHF World U20 Championship, but the first to be included in official IIHF records. Canada was represented by a club team, the St. Catherines Fincups (as the 1976 Memorial Cup champions), but the other seven nations were represented by teams of their top under-20 players.