Carstairs Douglas (Chinese: 杜嘉德; Pe̍h-ōe-jī: Tō͘ Ka-tek) (born 27 December 1830 in Kilbarchan, Renfrewshire; died 26 July 1877 in Xiamen, China) was a Scottish missionary, remembered chiefly for his writings concerning the Southern Min language of Fujian, in particular his Chinese–English Dictionary of the Vernacular or Spoken Language of Amoy.