Sixten Sild (born 19 June 1964, in Tartu) is an Estonian orienteering competitor, bronze medallist for the Soviet Union in the world championships, and later competing for Estonia.

He received a bronze medal in the classic course at the World Orienteering Championships in Mariánské Lázně in 1991.

Sild's best overall performance in the Orienteering World Cup was finishing 8th in 1996.

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