McLennan, MacLennan, and Maclennan are surnames derived from the Scottish Gaelic . Notable people with the surname include:
McLennan
Andrew Robert McLennan (1871–1943), Canadian politician
Azlan McLennan (born 1975), Australian artist
Bill McLennan (1942–2022), Australian statistician
Connor McLennan (born 1999), Scottish footballer
Danny McLennan (1925–2004), Scottish football player and manager
Donald R. McLennan (1873–1944), American business executive
Ethel Irene McLennan (1891–1983), Australian botanist and educator
Freddie McLennan (born 1951), Irish rugby union international
G. S. McLennan (1883–1929), Scottish bagpipe player
Gordon McLennan (politician) (1924–2011), Scottish leader of the Communist Party of Great Britain Gordon McLennan (rugby league) (1914–1966), Australian rugby league footballer Grant McLennan (1958–2006), Australian singer-songwriter with the band The Go-Betweens Gregor McLennan (born 1952), British sociologist Hector McLennan, Australian suffragist Jamie McLennan (born 1971), Canadian ice hockey player John McLennan (1821–1893), Canadian politician and businessman John Cunningham McLennan (1867–1935), Canadian physicist John Ferguson McLennan (1827–1881), Scottish ethnologist Kenneth McLennan (1925–2005), American military general Margo McLennan (1938–2004), English television actor Mark McLennan (born 1991), Scottish footballer Neil McLennan (died 1867), Scottish-American settler Nick McLennan (born 1988), New Zealand rugby union player Paul McLennan ( 2020s), Scottish politician Ross McLennan (singer), Australian singer Ross McLennan (drummer), Australian drummer Scotty McLennan (born 1948), American minister of religion, academic, lawyer and author
MacLennan/Maclennan
Angus MacLennan (1844–1908), Canadian politician
David MacLennan (1937–2020), Canadian biochemist and geneticist
Hector MacLennan, (1905–1978), Scottish gynaecologist
Hugh Dan MacLennan, Scottish broadcaster and writer
James Maclennan (1833–1915) Canadian lawyer, politician, and judge
John Hugh MacLennan (1907–1990), Canadian author and academic
Matt MacLennan (born 1976), Canadian film/television writer
Michael MacLennan (born 1968), Canadian playwright
Murdoch MacLennan (born 1949), Scottish media executive
Robert Maclennan, Baron Maclennan of Rogart (1936–2020), Scottish politician
Roddy MacLennan (born 1989), Scottish footballer
Rosie MacLennan, (born 1988), Canadian Olympic trampolinist (Gold) Ruari MacLennan (born 1988), Scottish footballer Scott MacLennan (born 1987), Scottish cricketer