Leszek Ryszard Dunecki (born 2 October 1956 in Toruń) was a Polish athlete who competed mainly in the 100 and 200 metres.

Dunecki's Polish national record of 20.26 was improved in 1999, by Marcin Urbas (19.98 s), after 20 years.

He competed for Poland in the 1980 Summer Olympics held in Moscow, Soviet Union in the 100 where he reached the Quarter final, and the 200 metres where he reached the final and finished 6th.

He also competed in the 4 x 100 metre relay where he won the silver medal with his teammates Krzysztof Zwoliński, Zenon Licznerski and Marian Woronin.

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