William McLellan

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