Brian Nicolás Mansilla Islas (born 14 May 2002) is a Uruguayan professional footballer who plays as a winger for Primeira Liga club Arouca.
Mansilla is a youth academy product of Peñarol. He was part of club's under-20 team which won the 2022 U-20 Copa Libertadores. He made his professional debut for Peñarol on 1 April 2022 in a goalless league draw against Rentistas.
In January 2024, Mansilla joined Defensor Sporting on a season long loan deal. On 15 January 2025, he joined Portuguese club Arouca on a loan deal until the end of the season. Six months later in July, he signed a three-year contract with Arouca.
Peñarol U20
Defensor Sporting