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William Davidson (engineer) (1844–1920), Australian civil engineer •
William Davidson (agribusinessman) (1846–1924), New Zealander, pioneer of refrigerated shipping
Harley-Davidson •
William A. Davidson, executive at Harley-Davidson Motor Company, brother of co-founders Arthur and Walter Davidson, and grandfather of Willie G. Davidson •
William H. Davidson (motorcyclist) (1905–1992), American motorcycle racer and president of Harley-Davidson Motorcycles •
Willie G. Davidson (William Godfrey Davidson, born 1933), former styling chief of Harley-Davidson and designer of the Harley-Davidson Super Glide ==Military==