Kirill Alexeyevich Alekseenko (Russian: Кирилл Алексеевич Алексеенко; born 22 June 1997) is a Russian-born chess grandmaster who currently plays for Austria.

[4] He competed in the 2015 World U18 Chess Championship held in Greece from 24 October to 6 November, placing second with 8½/11 (+8–2=1}, one point behind winner Masoud Mosadeghpour.

[17] Although he failed to qualify for the Chess World Cup 2019 through European Championship placement, Alekseenko was chosen as a wildcard nominee by the organiser of the tournament.

[19] At the 2019 European Team Chess Championship held in Batumi from 24 October to 2 November, Alekseenko represented Russia on the third board.

Alekseenko defeated Kacper Piorun of Poland in the final round, which proved decisive to Russia's first-place finish.

[22] At the FIDE Grand Swiss Tournament 2019 held in October on the Isle of Man, Alekseenko took third place on tie breaks with 7½/11 (+4–0=7), half a point behind winner Wang Hao and runner-up Fabiano Caruana.

[24] On 23 December 2019, Alekseenko was announced as the wildcard nominee for the Candidates Tournament, originally scheduled to be held in Yekaterinburg from 17 March to 3 April 2020.

[27] After the resumption of the Candidates Tournament 2020–21 in April 2021, Alekseenko returned to Yekaterinburg and played the final seven games.