William "Bill" Joseph Cowsill Jr., most commonly known professionally as Billy Cowsill, (January 9, 1948 – February 18, 2006) was an American singer, musician, songwriter, and record producer. He is notable as the lead singer and guitarist of The Cowsills, who had three top 10 singles in the late 1960s. From the mid-1970s until his death, he developed a career in Canada as an alt-country artist, as well as being the producer of a diverse number of Canadian artists.