Cieślar () and Cieślarz () are occupational surnames literally meaning 'carpenter'. It may refer to:
Adam Cieślar (born 1992), Polish Nordic combined skier Mieczysław Cieślar (1950–2010), Lutheran theologian and bishop of the Evangelical Augsburg Church in Poland Zdeněk Cieslar (born 1973), Czech footballer Zuzanna Cieślar (born 2000), Polish fencer