Bernardo Oliveira Dias (born 4 January 1997) is a Portuguese professional footballer who plays for C.F. Os Belenenses as a midfielder.
Born in Lisbon, Dias joined C.F. Os Belenenses' youth system in 2014, aged 17. On 14 August 2016 he made his Primeira Liga debut, starting and playing 56 minutes in a 0–2 away loss against Vitória de Setúbal.
Dias scored his first league goal on 24 September 2017, coming on as a second-half substitute and closing the 4–1 away win over C.D. Feirense.