McClellan is a Scottish surname. Notable people with the surname include:
- Antwan McClellan, American politician
- Barr McClellan, Texas lawyer and author, father of Mark and Scott McClellan
- Beverly McClellan (1969–2018), American singer and contestant in the first season of the American TV series The Voice
- Brian McClellan, American writer of fantasy
- C. M. S. McLellan (1865–1916), American playwright and composer, also wrote as Hugh Morton
- Edwin North McClellan (1881–1971), United States Marine Corps officer, author, and historian
- George McClellan (New York politician) (1856–1927), U.S. Representative from New York
- George McClellan (physician) (1796–1847), surgeon and founder of Jefferson Medical College in Philadelphia, Pennsylvania
- George McClellan (police officer) (1908–1982), Commissioner of the Royal Canadian Mounted Police
- George B. McClellan (1826–1885), American Civil War general and creator of the Army of the Potomac
- George B. McClellan Jr. (1865–1940), Mayor of New York City and U.S. Representative from New York
- George Marion McClellan (1860-1934), American writer
- Gerald McClellan American former professional boxer
- James E. McClellan (1926–2016), American veterinarian and politician
- James H. McClellan, mathematician and electronic engineer, professor at Georgia Institute of Technology
- Jase McClellan (born 2002), American football player
- John McClellan (chemist) (1810–1881), English chemist and industrialist
- John L. McClellan (1896–1977), U.S. Senator from Arkansas
- Joseph McClellan (1746–1834), American soldier and politician
- Katherine Elizabeth McClellan (1859-1934), American photographer
- Kyle McClellan (born 1984), American baseball player
- Kyle McClellan (ice hockey) (born 1999), American ice hockey player
- Mark McClellan (born 1963), Medicare and FDA official
- Mike McLellan (born 1981), Canadian indoor lacrosse player
- Peter McClellan, Australian jurist
- Robert McClellan (New York representative) (1806–1860), U.S. Representative from New York
- Robert McClellan (New York treasurer) (1747–1817), treasurer of New York state
- Robert H. McClellan (1823–1902), Illinois state senator
- Robert L. McClellan (1822–1889), American politician and lawyer from Pennsylvania
- Samuel McClellan (1730–1807), brigadier general in the American Revolutionary War
- Scott McClellan (born 1968), former White House press secretary
- Sid McClellan (1925–2000), footballer who played for Tottenham Hotspur, Portsmouth and Leyton Orient.
- Stephen T. McClellan, Wall Street analyst, author
- Thomas N. McClellan (1853–1906), associate justice and chief justice of the Supreme Court of Alabama
Fictional characters:
- Clarisse McClellan, a character in Fahrenheit 451 by Ray Bradbury
- "Mrs. McClellan," a character without a first name in Ray Bradbury's story "There Will Come Soft Rains."
See also
- McClellan Air Force Base
- McClellan's General Store, listed on the National Register of Historic Places in Henry County, Iowa
- McClellan Park, California, a census-designated place near Sacramento
- McClellan–Palomar Airport in Carlsbad, California
- McClellan Magnet High School in Little Rock, Arkansas
- The McClellan saddle, used in the late 19th century by U.S. Army cavalry
- USAT McClellan, a US Army Transport ship active during the Spanish-American and First World Wars
- McLellan
- Clan MacLellan, Scottish clan
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