David Charles Marsden (born in Toronto, Ontario) is a Canadian radio broadcaster. Initially operating under the on-air name of Dave Mickie, with much fast-talking patter, he was a notable Toronto DJ of the 1960s who attracted critical attention from Marshall McLuhan. Reinventing himself, and using his real name of David Marsden, he became a much more laid-back free-form DJ, notably at CHOM in Montreal then CHUM-FM in Toronto in the 1970s. He then became the driving force behind Brampton, Ontario radio station CFNY in the 1980s, becoming an influential figure in the Canadian music industry by giving many Canadian and international alternative rock artists major Canadian radio exposure. During his stint at CFNY, his nickname (often referred to on-air) was "The Mars Bar".
Marsden currently runs the on-air streaming service nythespirit.com.