Konstantinos Kanellopoulos (Greek: Κωνσταντίνος Κανελλόπουλος) was a Greek Navy officer who reached the rank of rear admiral.
He was born in 1872, the nephew of the notable naval officer and educator Ilias Kanellopoulos.[1] He joined the Royal Hellenic Navy as an ensign in 1890, and fought in the Greco-Turkish War of 1897 and the Balkan Wars of 1912–13.[1] He retired with the rank of rear admiral on 10/23 May 1920.[1]
His older brother, Filippos, also became a naval officer and reached the rank of vice admiral.[1]