Rasmus Nielsen may refer to:
Rasmus Nielsen (footballer) (born 1987), Danish footballer Rasmus Nielsen (volleyballer) (born 1994), Danish volleyballer Rasmus Nielsen (ice hockey) (born 1990), Danish ice hockey player Rasmus Nielsen (squash player) (born 1983), Danish squash player Rasmus Nielsen (philosopher) (1809–1884), Danish philosopher and professor Rasmus Nielsen (biologist) (born 1970), professor of integrative biology at UC Berkeley Rasmus Kleis Nielsen, professor of political communication