Relander is a surname. Notable people with the surname include:
- Hugo Relander (1865–1947), Finnish mathematician and politician
- Kaj-Erik Relander, Finnish businessman and investor
- Lauri Kristian Relander (1883–1942), Finnish politician and 2nd President of Finland
- Signe Relander (1886-1962), wife of Lauri Kristian Relander
- Sven Relander (1897–1956), Finnish actor