The 2018 Supertaça Cândido de Oliveira was the 40th edition of the Supertaça Cândido de Oliveira. It was played on 4 August 2018, at the Estádio Municipal de Aveiro, between the winners of the 2017–18 Primeira Liga, Porto, and the winners of the 2017–18 Taça de Portugal, Desportivo das Aves. Porto won 3–1 and thus secured their first Supertaça title since 2013 and extended their record to 21 titles overall.
Aveiro Municipal Stadium was announced as the venue for both the 2017 and 2018 editions of Supertaça Cândido de Oliveira on 6 June 2017, following the decision of the Portuguese Football Federation Directive Board. This was the ninth time that this stadium hosted the Supertaça Cândido de Oliveira, after 2009, 2010, 2011, 2012, 2013, 2014, 2016 and 2017.