Oleiros is a Portuguese village in the municipality of Guimarães which was the administrative centre of the former parish of Oleiros, covering an area of with a population of 462 (2011), giving it a population density of 139.6 inhabitants per km².
It was abolished in 2013 as part of a national administrative reform, so that, together with the parishes of Leitões and Figueiredo, it could form a new parish called Leitões, Oleiros e Figueiredo, with its administrative centre of it being in Leitões.
Its entire territory dates back to pre-Roman times, and the São Miguel hillfort, situated on mount São Miguel, which Oleiros shares with neighbouring parishes, sits there since the Castro period. Furthermore, this parish also contains archaeological remains of ancient settlements, which bear witness to its long history. An archaeological inventory of the parish records the existence of the remains of a thermal bath complex on mount Susana, which operated using a hypocaust, a surface heating system in which heat was generated by a furnace. The earliest known document relating to Oleiros dates from 924 and concerns a donation by a priest, Belisário, to another priest, Gosendo.
Population Population of the parish of Oleiros (1864 – 2011) Instituto Nacional de Estatística (Recenseamentos Gerais da População) - https://www.ine.pt/xportal/xmain?xpid=INE&xpgid=ine_publicacoes 1864 1878 1890 1900 1911 1920 1930 1940 1950 1960 1970 1981 1991 2001 2011 332 347 405 380 348 364 452 328 458 481 531 527 449 510 462
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