Roger Leonard, also known as Deke Leonard (born 18 December 1944, Llanelli, Wales - died 31 January 2017) was a Welsh rock guitarist and keyboardist. From 1968 until 1972 he was a member of The Bystanders (which was renamed as Man). In 1973, he formed his own band Iceberg, which disbanded the same year. He went on to play with incarnations of both groups in later years.