Denis O'Connor may refer to:
- Sir Denis O'Connor (British Army officer) (1907–1988), British general
- Sir Denis O'Connor (police officer) (born 1949), British police officer
- Denis O'Connor (bishop) (1841–1911), Roman Catholic Archbishop of Toronto
- Denis O'Connor (British-Irish sculptor), sculptor
- Denis O'Connor (sculptor) (born 1947), New Zealand ceramicist, sculptor and writer
See also
edit- Dennis O'Connor (disambiguation)
- Denis O'Conor, Irish nobleman and politician
- Denis Charles Joseph O'Conor, Irish lawyer
- Denis Maurice O'Conor, Irish politician