William McLellan may refer to:

• William McLellan (Australian politician) (1831–1906), mining agent and politician in colonial Victoria
• William McLellan (Scottish electrical engineer) (1874–1934), known for contributions to hydroelectric power
• William McLellan (American electrical engineer) (1924–2011), known for contributions to nanotechnology
• William Walker McLellan (1873–1960), founder of McLellan Stores
• William H. McLellan (1832–1912), American lawyer and politician

See also

• William Maclellan (15th century), Scottish nobleman
• William E. McLellin (1806–1883), early leader in the Latter Day Saint movement

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