Santa Comba Dão (Portuguese pronunciation: [ˈsɐ̃tɐ ˈkõbɐ ˈðɐ̃w]) is a city and a municipality in the district Viseu in Portugal. The population in 2011 was 11,597, in an area of 111.95 km². The city proper has a population of 3,300.
The present mayor is Leonel Gouveia, elected in 2013 by Socialist Party. The municipal holiday is Ascension Day.
António de Oliveira Salazar, who was the Prime Minister of Portugal from 1932 to 1968 and leader of the Estado Novo, was born in Vimieiro, Santa Comba Dão on 28 April 1889.
The town's station was formerly a terminus of the Dão line to/from Viseu. This narrow gauge railway closed to passengers in 1988.
Administratively, the municipality is divided into 6 civil parishes (freguesias):