Casila Abdul Samed "Sinhala" Marikkar (5 July 1911 - 18 November 1970) was a Sri Lankan politician. He served as Minister for Post, Broadcasting and Communication from 1956 until 1960 in the S. W. R. D. Bandaranaike cabinet and Dahanayake cabinet, and was a member of parliament representing the Sri Lanka Freedom Party (SLFP) from Kadugannawa.