Kurt Gänzl (born 15 February 1946) is an award-winning writer, musicologist, casting director and singer best known for his books about musical theatre.
After a long acting and singing career and a career as a casting director of West End shows, Gänzl has become one of the world's most important chroniclers of the history of musical theatre. According to Canal Académie, "Kurt Gänzl is an institution. No one interested in musicals and operetta can ignore that. He is the world reference – with some few others, like Gerald Bordman, Ken Bloom, or Andrew Lamb – for that subject".