William Mundy (c. 1529–1591) was a prominent English composer of sacred music during the Renaissance, bridging the Reformation, Edwardian, Marian, and Elizabethan periods. Known for his intricate polyphonic compositions, Mundy's work reflects the religious and political upheavals of his time. As a vicar-choral at St Paul's Cathedral and later a Gentleman of the Chapel, he held significant positions that influenced his musical output. Mundy's legacy is further enriched by his role as the father of the renowned composer John Mundy. His music, characterized by its depth and complexity, continues to captivate audiences and remains a cornerstone of 16th-century English choral tradition.