1979–80 NHL transactions
The following is a list of all team-to-team transactions that have occurred in the National Hockey League during the 1979–80 NHL season. It lists what team each player has been traded to, signed by, or claimed by, and for which player(s) or draft pick(s), if applicable. Trades between teams

May

June 

 Quebec selected Alain Cote in the 1979 NHL Expansion Draft. Trade completed on June 14, 1979. Trade completed on August 16, 1979. Minnesota's second-round pick went to Calgary as the result of a trade on June 7, 1982 that sent Willi Plett and Calgary's fourth-round pick in 1982 NHL Entry Draft to Minnesota in exchange for Steve Christoff, Bill Nyrop and this pick. July

August

 The original pick was for a 2nd-rd pick in the 1980 NHL Entry Draft but was changed to a 2nd-rd pick in the 1982 NHL Entry Draft on June 11, 1980 (1980 NHL Entry Draft) day. This was a compensation trade. The rights to Dale McCourt were transferred to Los Angeles as compensation to Detroit signing restricted free agent Rogatien Vachon on August 8, 1979. McCourt refused to report to Los Angeles and sued the NHL, NHLPA, Detroit and Los Angeles. The matter was resolved and McCourt stayed with Detroit. Los Angeles had the option of a 2nd-rd pick in 1980 or 1st-rd pick in 1981 NHL Entry Draft. They selected in the 1981 draft. September 

 The trade was for a conditional 3rd-rd or 4th-rd pick in 1981 NHL Entry Draft. The pick was made in the 4th-rd but the condition of the pick is unknown. October 

 Calgary's fourth-round pick went to Minnesota as the result of a trade on June 7, 1982 that sent Steve Christoff, Bill Nyrop and Minnesota's second-round pick in 1982 NHL Entry Draft to Calgary in exchange for Willi Plett and this pick. November 

 Trade completed on January 15, 1980. December

January 

 Minnesota's second-round pick went to Montreal as the result of a trade on August 8, 1979 that sent Bill Nyrop to Minnesota in exchange for Minnesota's second-round pick in 1979 NHL Entry Draft and second-round pick in 1980 NHL Entry Draft. The trade was later changed for this pick on June 11, 1980 (1980 NHL Entry Draft day). February

March

Additional sources
 hockeydb.com - search for player and select "show trades"

References

National Hockey League transactions
Transactions