Loudon is both a surname and a given name. Notable people with the name include:
Surname: Aarnout Loudon (1936–2021), Dutch corporate executive and politician Alex Loudon (born 1980), English cricketer Chris Loudon (born 1967), American animator Dave Loudon (born 1954), Scottish cricketer Dorothy Loudon (1925–2003), Broadway actress Ernst Gideon Freiherr von Laudon, often written as Loudon (1717–1790), Austrian general Harald von Loudon (1876–1959), Baltic-German ornithologist Irvine Loudon (1924–2015), British doctor, medical historian and artist James Loudon (1841–1916), Canadian professor of physics James Loudon (politician) (1824–1900), Dutch politician, governor of Dutch East Indies Jane Loudon (née Webb, 1807–1858), English novelist and horticulturist Johann Ludwig Alexius von Loudon (1767–1822), Austrian general John Claudius Loudon (1783–1843), Scottish botanist John Loudon (minister) (1866–1955), Dutch politician and statesman John Hugo Loudon (1905–1996), Dutch CEO of Royal Dutch Shell, and president of the WWF John William Loudon (born 1967), Missouri state senator Margracia Loudon (c.1788–1860), Irish novelist and political author Peter Loudon (born 1966), Scottish curler Rodney Loudon (1934–2022), British quantum physicist Thomas Loudon (1883–1968), Canadian rower Trevor Loudon, New Zealand political activist William James Loudon (1860–1951), Canadian geologist and photographer
Given name: Loudon Wainwright, Jr. (1924–1988), American writer Loudon Wainwright III (born 1946), American musician William Loudon Mollison (1851–1929), Scottish mathematician and academic
See also Louden (disambiguation) Loudin