Pieter Sisk (born 8 December 1999) is a Belgian middle-distance runner, who specializes in the 800 metres.

[2] Sisk qualified for the 800 meters at the 2024 Summer Olympics with his time of 1:44.46, which he ran in Brussels on 25 May 2024.

[3][4][5] At the Olympics, he failed to qualify for the semi-finals after finishing 6th in the heats and 3rd in the repechages.

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