William AJR Korwenkoski, oikealta nimeltään William Arto Juhani Rinne, on lauluntekijä, artisti, runoilija ja sanoittaja. Hänestä tuli juomalaulun Suomenmestari 1999. Korwenkoski on tehnyt useita levytyksiä.

William AJR Korwenkoski is a Finnish singer-songwriter, producer and poetess, who has made several recordings through the years. His first album "Jätkän elämää" came out in 1997, and in 1999 he was the winner of the Finnish drinking song contest. William Korwenkoski's real name is William Arto Juhani Rinne.

As a producer his most remarkable project has so far been Finnhorse - The Proper Horse (Suomenhevonen - kunnon hevonen) album, which was published in 2007 as a part of Finnhorse's 100-year-old celebrations. Arto Juhani Rinne wrote and composed several songs for the album, and also performed on it under his stage name William Korwenkoski.