Dionísio Silva Castro (born 22 November 1963 in Fermentões-Guimarães) is a former long-distance runner from Portugal, best known for setting the world record in the 20,000 metres on 31 March 1990, when he clocked 57:18.4 in La Flèche. Castro continued for another 943 metres in an attempt to break Jos Hermens' world record for the one hour run as well, but missed out by one metre.
His twin brother Domingos was also a world class athlete in the long distance events. The two of them represented their native country at the 1988 (Seoul, South Korea) and 1992 Summer Olympics (Barcelona, Spain).
- All results regarding marathon, unless stated otherwise
|1992||Olympic Games||Barcelona, Spain||—||DNF|
|Men's 20,000 m world record holder
31 March 1990 – 30 March 1991
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