Oliveira do Castelo is an extinct freguesia in the municipality of Guimarães, with an area of 0.69 km and 3265 inhabitants (2011). Its population density was of 4,731.9 inhabitants/km. A big part of it is located in the Historic Center of Guimarães.

It was the seat of a freguesia that was abolished in 2013, as part of a national administrative reform, to form a new parish, together with São Paio and São Sebastião, called Oliveira, São Paio e São Sebastião, with its seat at Alameda de São Dâmaso in Guimarães.

• Castle of Guimarães, 10th century medieval castle.
• Palace of the Dukes of Braganza, 15th century palace belonging to the Dukes of Braganza, it is also one of the most visited places in Portugal with 366.514 visits in 2022.
• Nossa Senhora da Oliveira Church, 10th century church.
• Paços do Concelho de Guimarães, the previous câmara municipal of the city.
• Padrão do Salado, 14th century monument celebrating the Portuguese victory at the Battle of Río Salado.
• Church of São Miguel do Castelo, the church where Afonso Henriques was presumably baptised.
• Chapel of Santa Cruz, 17th century chapel.

Population of the freguesia of Oliveira do Castelo (1864 – 2011)

Year Pop. ±% 1864 3,400 —     1878 3,626 +6.6% 1890 3,718 +2.5% 1900 4,084 +9.8% 1911 4,278 +4.8% 1920 3,926 −8.2% 1930 4,324 +10.1% 1940 4,905 +13.4%	Year Pop. ±% 1950 5,408 +10.3% 1960 5,501 +1.7% 1970 4,579 −16.8% 1981 4,887 +6.7% 1991 3,687 −24.6% 2001 3,448 −6.5% 2011 3,265 −5.3%
Source:

Partidos	%	M	%	M	%	M	%	M	%	M	%	M	%	M	%	M	%	M	%	M
	1976		1979		1982		1985		1989		1993		1997		2001		2005		2009
CDS-PP	31,3	3					20,0	2	13,3	1	9,7	1	7,7		7,7		6,3		10,9	1
PS	29,9	3	31,2	4	35,9	5	30,1	3	39,3	4	42,7	4	43,2	5	40,1	4	38,4	4	32,4	3
PPD/PSD	20,7	2					37,6	4	37,6	4	36,2	4	33,5	3	38,8	4	38,9	4	44,0	4
FEPU/APU/CDU	11,8	1	15,3	2	12,3	1	9,1		6,9		7,9		11,5	1	9,5	1	11,5	1	9,3	1
AD			53,5	7	49,5	7