Matjaž Debelak (born 27 August 1965, in Braslovče) is a Slovenian former ski jumper who competed for Yugoslavia from 1986 to 1990.

His best-known successes were at the 1988 Winter Olympics, where he earned two medals with a silver in the team large hill event and a bronze in the individual large hill event.

Debelak's best finish at the FIS Nordic World Ski Championships was a 6th in the individual normal hill in 1989.

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