Konstantinov (Bulgarian: Константинов, Russian: Константинов) and Konstantinova (feminine; Константинова) is a common Slavic surname derived from the baptismal name Konstantin.
People with this surname include:
- Aleko Konstantinov (1863-1897), Bulgarian writer
- Alexander Konstantinov (1895-1945), Soviet inventor and scientist in the field of radiophysics
- Anatoly Konstantinov (1923-2006), Soviet aircraft pilot and Hero of the Soviet Union
- Boris Konstantinov (1910-1969), Soviet physicist, academician, and Hero of Socialist Labor
- Evgeny Konstantinov (b.1981), Russian ice hockey player
- Fyodor Konstantinov (1901-?), Soviet philosopher and academician
- Ina Konstantinova (1924-1944), Soviet World War II partisan and diarist
- Julian Konstantinov (b. 1966), Bulgarian operatic bass
- Konstantin Konstantinov (1817 or 1819 - 1871), Russian scientist in the field of artillery, rocketry, instrument making, and automatics
- Kosev Dimitr Konstantinov (b.1903), Bulgarian historian and academician
- Ksenia Konstantinova (1925-1943), Soviet nurse and Hero of the Soviet Union
- Mikhail Konstantinov (b.1924), Soviet architect
- Minkov Svetoslav Konstantinov (1902-1966), Bulgarian writer
- Nikolay Konstantinov (b. 1932), Russian mathematics educator
- Plamen Konstantinov (b. 1973), Bulgarian volleyball player
- Pyotr Konstantinov (1899-?), Soviet actor and People's Artist of the USSR
- Pyotr Konstantinov (1877-1959), Soviet plant-breeder, selectionist, and academician
- Tamara Konstantinova (1919-1999), Soviet aircraft pilot and Hero of the Soviet Union
- Vitali Konstantinov (b. 1963), German artist and book illustrator
- Vladimir Konstantinov (1921-1979), Soviet aircraft pilot and Hero of the Soviet Union
- Vladimir Konstantinov (b. 1967), former Russian professional hockey player
- Anja Konstantinova (b. 1990) a Russian-born Australian model