Thorndon may refer to:
People Giles Thorndon (1388–1477), official of the English Crown Robin Cooke, Baron Cooke of Thorndon (1926–2006), New Zealand judge and member of the British House of Lords
Buildings and places New Zealand Thorndon, New Zealand, suburb of Wellington Thorndon Railway Station, former railway station Thorndon School, primary and intermediate school Thorndon (New Zealand electorate), New Zealand general electorate
United Kingdom Aspall and Thorndon railway station, former railway station on the Mid-Suffolk Light Railway Thorndon Hall, Georgian Palladian country house in Ingrave, Essex Thorndon Park Chapel, former Roman Catholic private chapel in the grounds of Thorndon Hall Thorndon, Suffolk, village and civil parish in Suffolk
Other Thorndon Mile, Thoroughbred horse race in Wellington, New Zealand