William Joseph Mayerl (31 May 1902 – 25 March 1959) was an English pianist and composer who built a career in music hall and musical theatre and became an acknowledged master of light music. Best known for his syncopated novelty piano solos, he wrote over 300 piano pieces, many of which were named after flowers and trees, including his best-known composition, Marigold (1927). He also ran the successful School of Syncopation for whose members he published hundreds of his own arrangements of popular songs.