Paulus Roelof Cantz'laar (Amsterdam, 22 November 1771 – Paramaribo, 15 December 1831) was a Dutch naval officer and colonial governor. Cantz'laar joined the Dutch Republic navy in 1790 as midshipman and was promoted to lieutenant in 1793. In 1795 the entire service of sea officers was dismissed and he rejoined the navy of the Batavian Republic in 1799. He was promoted to first lieutenant on 23 August 1800 and to captain lieutenant on 23 November 1804. In 1808 he got the title of lieutenant colonel. After a sea battle on 21 October 1813, he was taken to England as a prisoner of war, where he would remain until 1813.