Balabay Azer oglu Aghayev (Azerbaijani: Balabəy Azər oğlu Ağayev; born 30 September 1998) is an Azerbaijani judoka, silver medalist of the 2024 European Judo Championships, member of the Azerbaijan national judo team.

In April 2022, he placed fifth at the European Championships in Sofia, losing the bronze medal match to Jorre Verstraeten of Belgium.

[5] That summer, at the Islamic Solidarity Games in Konya, he won gold in the under 60 kg category and in the men's team event.

[11][12] In April 2024, Aghayev won silver at the European Championships in Zagreb, losing in the final to reigning world champion Francisco Garrigós of Spain.

[13] At the 2024 Summer Olympics, Aghayev was eliminated in the round of 16, losing to Kim Won-jin of South Korea.