William "Penfro" Rowlands (19 April 1860 – 22 October 1937) was a Welsh schoolteacher and composer. Probably his best-known composition is the hymn-tune "Blaenwern", composed in 1905 and often used as the setting for Love Divine, All Loves Excelling. As well as being a church musician, Rowlands taught in several schools and was conductor of the Morriston United Choral Society.