Dilhan is both a given name and a surname. Notable people with the name include:
Dilhan Cooray (born 1987), Sri Lankan cricketer Dilhan Eryurt (1926–2012), Turkish astrophysicist Dilhan Perera (born 1969), Sri Lankan cricketer Dilhan Pillay Sandrasegara (born 1963), Singaporean lawyer Marguerite Dilhan (1876–1956), French lawyer