Viliam Figuš-Bystrý (born Viliam Figuš) (28 February 1875 – 11 May 1937) was a Slovak composer, teacher and author of the first Slovak national opera Detvan.
While teaching in various towns, he collected folksongs and published their adaptations in a few collections (Slovenské ľudové piesne z Veľkej Slatiny, 1000 slovenských ľudových piesní, Púchovské piesne, Zbojnícke piesne). Also in his compositions, he was inspired by folksongs from central Slovakia and in youth also from Hungary. Besides arranging folksongs, he composed orchestral works, chamber music, cantata, piano and violin pieces and songs. In 1926, he finished his opera Detvan, Op. 64, the first Slovak national opera, based on poem Detvan by Andrej Sládkovič.
Figuš-Bystrý was an important part of musical life in Banská Bystrica. He was one of the founding members of the Association of the Slovak Artists, being its chairman in 1925.