Fiersa Besari (born 3 March 1984) is an Indonesian singer, songwriter, musician and author. He is best known for his music, which is often described as an "indie music" style. Besari has made several albums, including Tempat Aku Pulang (2014) and Konspirasi Alam Semesta (2015) and has recorded hit songs including "Celengan Rindu", "Waktu yang Salah" dan "April".

As an author, he has produced six novels and also involved as one of the founders of Komunitas Pecandu Buku (English: Book Addict Community). Besari is also active as a mountaineering content creator. He is starting Atap Negeri journey where he will climb 33 mountains in 33 provinces in Indonesia which will be uploaded on his YouTube channel.