Markos Kalovelonis (Greek: ?????? ?a??ße?????, Russian: ?????? ???????????; born 18 May 1994) is a Greek-Russian tennis player.
Kalovelonis has a career high ATP singles ranking of 607 achieved on 14 December 2015.
He also has a career high ATP doubles ranking of 297 achieved on 2 November 2015.
Kalovelonis has won 8 ITF doubles titles.
Kalovelonis has represented Greece at the Davis Cup where he has a W/L record of 6–5.
Kalovelonis is the son of former Greek tennis player, George Kalovelonis and Russian Karina Nazarenko.
In 2014, Kalovelonis decided to represent Russia instead of Greece.
In 2019, Kalovelonis switched back to represent Greece.