Joaquim Carvalho Cruz is a Brazilian former middle-distance runner, winner of the 800 meters at the 1984 Summer Olympics. He is one of only five men to run the 800 metres in less than 1 minute, 42 seconds.

The 1984 Summer Olympics were an international multi-sport event held from July 28 to August 12, 1984, in Los Angeles, California, United States. It marked the second time that Los Angeles had hosted the Games, the first being in 1932. California was the home state of the incumbent U.S. President Ronald Reagan, who officially opened the Games. These were the first Summer Olympic Games under the IOC presidency of Juan Antonio Samaranch.