Balduin Hoyoul (1547-8 – 26 November 1594) was a Renaissance composer of the Franco-Flemish school.
Hoyoul was born in Liège. From the age of 13 he was a singer at the Court in Stuttgart under Ludwig Daser. 1563-64 he was a pupil of Lassus in Munich. In 1589 he took over from his father-in-law as Hofkapellmeister in Stuttgart. In 1593 he applied, unsuccessfully, for the more prestigious court post at Dresden.