Eiras is a former civil parish in the municipality of Coimbra, Portugal. The population in 2011 was 12,097, in an area of 9.02 km. On 28 January 2013 it merged with São Paulo de Frades to form Eiras e São Paulo de Frades.

Population of the civil parish of Eiras (1801–2011) Year Pop. ±% 1801 654 —     1864 780 +19.3% 1878 970 +24.4% 1890 1,146 +18.1% 1900 1,223 +6.7% 1911 1,528 +24.9% 1920 1,576 +3.1% 1930 2,235 +41.8% 1940 2,780 +24.4% 1950 3,538 +27.3% 1960 3,988 +12.7% 1970 4,811 +20.6% 1981 8,364 +73.9% 1991 9,655 +15.4% 2001 12,052 +24.8% 2011 12,097 +0.4%