Warren John Fahey AM (born 3 January 1946) is an Australian folklore collector, cultural historian, author, actor, broadcaster, record and concert producer, visual artist, songwriter, and performer of Australian traditional and related historical music. He is the founder of Folkways Music (1973), Larrikin Records (1974) and a folk music ensemble, the Larrikins (1975).

Fahey has had a long association with ABC Radio, and has received numerous awards for his folklore efforts, including the 2010 Don Banks Music Award.

Warren John Fahey was born on 3 January 1946 and grew up in Sydney. His father, George Fahey, and mother, Deborah (née Solomon), were each members of large families. Fahey attended Marist Brothers College, Kogarah.

Fahey has a distinguished career as a folklorist and collector of oral histories. His collection has been housed in the National Library of Australia since 1973.

As a performer he tells Australian folk stories, recites bush poetry, and sings either solo or with The Larrikins, The Celebrated Knickers & Knockers Band, and the Australian Bush Orchestra. Lahey started performing in 1969 and has a repertoire of bush songs, early ballads, city ditties and associated folklore including poetry, drinking toasts and parodies. He presents entertainment programs based on his books at various Writers Week festivals as well as performances at folk and regional arts festivals. He plays an English Edeophone concertina.

In 1970, Fahey began a folklore unit in Sydney, where he collects material of cultural significance. His Australian folklore unit has been collecting and annotating Australian folklore for nearly 50 years and made available in his books, radio programs, concerts and, on his website. In 1973, he established Folkways Music as a "retail music outlet specialising in folkloric recordings and publications." The store supplied "records, books, sheet music and instruments" and commenced "as a means to financing its proprietor's collecting activities. It received no government assistance, and for its first year was subsidised by advertising work."

Fahey founded Larrikin Records in 1974 "to publish and commercially release extended play recordings featuring Australian traditional folk music and songs for both educational and entertainment purposes." The label's first album, Man of the Earth: Songs and Ballads of the Australian Mining Industry (1975), produced by Lahey, credited Fahey on lead vocals; Dave de Hugard on concertina, button accordion and fiddle; Phyl Lobl on guitar, Mike Jackson on mouth organ and spoons; Andy Saunders on 5-string banjo and guitar; and Tony Suttor on accordion. Fahey also produced the album. By 1995, the record company was one of the largest independent distributors in Australia, and was acquired by Festival Records.

Larrikin Music, a publishing company Fahey sold in 1988 owns the rights to the well-known children's "Kookaburra song". In a high-profile case that began in 2009, Norm Lurie, then the managing director of Music Sales, Larrikin Music's parent company, sued the group Men at Work for using its melody in five bars of their 93-bar song "Down Under". After the Down Under court case, Fahey, who had nothing to do with the court case, suggested that the copyright owners of the Kookaburra, Larrikin Music, 'gift' the song to Australia.