Mário Viegas Carrascalão was an East Timorese politician and diplomat. Carrascalão, a founder of the Timorese Democratic Union (UDT) in 1974 and the Social Democratic Party (SDP) in 2000, served as the governor of East Timor from 1981 to 1992 during the Indonesian occupation of the country. However, he re-joined the East Timorese government following the 1999 independence referendum and the transition to independence. He later served as a deputy prime minister within the IV Constitutional Government of then-Prime Minister Xanana Gusmão from 2009 to 2010.

The Timorese Democratic Union is a conservative political party in East Timor. It was the first party to be established in the country on May 11, 1974, following the Carnation Revolution in Portugal.