Matheus dos Santos Dias (born 9 May 2002), known as Matheus Dias, is a Brazilian professional footballer who plays as a midfielder for Nacional on loan from Internacional.

Born in São Paulo, Matheus Dias joined Internacional's youth setup in 2021, on loan from Tombense.

[2] Matheus Dias made his first team debut on 2 February 2022, coming on as a late substitute for Andrés D'Alessandro in a 0–0 Campeonato Gaúcho away draw against São Luiz.

[3] On 28 April, the club exercised his buyout clause, paying R$ 500,000 for 60% of his economic rights.

[4] Matheus Dias made his Série A debut on 8 November 2022, replacing Johnny Cardoso in a 1–0 away win over São Paulo.