The 1986 Copa Interamericana was the tenth edition of the Copa Interamericana, the annual football match contested between the winners of the CONCACAF Champions' Cup and the Copa Libertadores. It was played over two legs between Alajuelense of Costa Rica and River Plate of Argentina. The first leg was played at Estadio Alejandro Morera Soto, Alajuela, on 25 July 1987 and the second leg was played on 16 August 1987 at the Estadio Monumental, Buenos Aires. Both teams were appearing in the competition for the first time.
The teams had qualified for the tournament by winning the two seasonal continental competitions. River Plate were the reigning champions of the Copa Libertadores, winning the 1986 final against Colombian team América de Cali 3–1 on aggregate. Alajuelense won 1986 CONCACAF Champions' Cup, beating Surinamese team S.V. Transvaal 6–2 over two legs.
A crowd of 15,991 observed the first leg at the Estadio Alejandro Morera Soto, which resulted in a goalless draw. Watched by a crowd of 20,000 at the Estadio Monumental, River Plate took the lead in the first half when Jorge Villazán scored. Juan Gilberto Funes extended their lead in the second half, and Héctor Enrique added one further seven minutes later. Following a 3–0 scoreline, River Plate secured their first Copa Interamericana.