Flor Peeters, born Franciscus Florentinus Peeters on July 4, 1903, in Tielen, Belgium, was a renowned Belgian composer, organist, and academic teacher. He passed away on his 83rd birthday, July 4, 1986, in Mechelen, Belgium. Peeters was the youngest of eleven children and began his musical education at the Lemmens Institute in Mechelen at the age of sixteen, studying under Lodewijk Mortelmans, Jules Van Nuffel, and Oscar Depuydt. He graduated with the highest honor, the Lemmens-Tinel Prize.

In 1923, Peeters became an organ teacher at the Lemmens Institute and the chief organist at St. Rumbold's Cathedral in Mechelen, a position he held for the rest of his life. He later became the director of the Conservatorium in Antwerp. As an organist, Peeters was celebrated worldwide, known for his concerts and masterclasses, as well as his recordings of early organ music. He composed over 100 works, primarily for organ and choir, with notable pieces such as "Entrata Festiva" (Opus 93) and "Toccata, Fugue and Hymn on 'Ave Maris Stella'" (Opus 28).

Peeters's music was deeply rooted in the traditions of Western music, incorporating elements of Gregorian chant and Flemish polyphony, while also embracing modern techniques like polyrhythms and polytonality. Despite being labeled a conservative composer, his work was inclusive, synthesizing traditional and contemporary elements. His contributions to music were recognized with honors such as being made a baron by King Baudouin of Belgium and being appointed a Knight Commander in the Order of Saint Gregory the Great. Among his students was the American organist and composer Kathleen Thomerson.