Matheus de Mello Costa (born 26 January 1995), known as Matheus Costa, is a Brazilian professional footballer who plays as a centre-back for Liga Portugal 2 club Leixões. He also holds Portuguese nationality.
Matheus Costa made his league debut against F.C. Barreirense on 30 October 2016. He scored his first goals for the club against Sacavenense on 10 December 2016, scoring in the 42nd and 52nd minute.
Matheus Costa made his league debut against Braga B on 28 August 2017. He scored his first goal for the club against Arouca on 10 December 2017, scoring in the 90th minute.
Matheus Costa made his league debut against MarÃÂtimo B on 18 August 2019. He scored his first goals for the club against Penafiel on 16 January 2021, scoring in the 35th and 84th minute.
Matheus Costa joined MarÃÂtimo on 28 May 2021. He made his debut against FC Porto on 22 August 2021. Matheus Costa scored his first league goal against C.D. Tondela on 7 November 2021, scoring in the 75th minute.
Matheus Costa made his league debut against Mirassol on 17 February 2024. He scored his first goal for the club in the Copa do Brasil on 15 March 2024, scoring against Anápolis in the 45th+3rd minute.
In August 2025, Costa moved to Angola, joining Girabola club Petro de Luanda on a contract until the end of the season.
On 31 January 2026, after having made just four appearances for Petro de Luanda, Costa returned to Portugal, joining his former club Leixões, who sat bottom of the Liga Portugal 2 table.