Jozef Plachý (born 28 February 1949) is a Slovak former middle distance runner. He competed for Czechoslovakia at the 1968, 1972 and 1976 Summer Olympics in the 800 m and at the 1980 Olympics in the 1500 m event with the best result of fifth place in 1968.[1] In 1969–1974 Plachý won four medals at European championships, indoors and outdoors. On 27 June 1973 he "helped" Marcello Fiasconaro, by chasing him through the race, to set an 800 m world record in Milan.[2]