Mariana Fernandes de Sousa (born 19 February 2001), known professionally as Mari Fernandez, is a Brazilian singer, songwriter, businesswoman and instrumentalist. She became known for the songs "Não, Não Vou", which started her career, and for the song "Parada Louca", released in partnership with singer Marcynho Sensação.

Born in Alto Santo, Fernandez began singing at the age of seven, at school and in the churches she attended, giving the first signs of her interest in a musical career. At ten, she got her first guitar, and started learning to play with the help of her stepfather, and at fifteen, she wrote her first song.

Fernandez began her career in 2021, when she released her album "Piseiro Sofrência", among which the song "Não, Não Vou" stood out, which reached number one on Spotify Brasil. Between 2021 and 2024, she released songs such as "Comunicação Falhou", "Eu Gosto Assim" and "Seu Brilho Sumiu", among others, with partnerships such as Nattan, Gustavo Mioto, Israel & Rodolffo and Maiara & Maraisa.