Peter Cornelius (1824–1874) was a German composer.
Peter Cornelius may also refer to:
Pieter Corneliszoon Plockhoy (c. 1625–c. 1664/70), Dutch Mennonite who founded a settlement in Delaware, USA Peter von Cornelius (1783–1867), German painter Peter Cornelius (opera singer) (fl. 1892–1922), Danish opera singer Peter Cornelius (photographer) (1913–1970), German photographer and photojournalist Peter Cornelius (singer-songwriter) (born 1951), Austrian singer-songwriter of Austropop, guitarist, and a former member of Enigma