Dyakov (Russian: Дьяков, Bulgarian: Дяков) is a Slavic-language surname derived from the occupation of dyak (clerk). The surname may also be transliterated as Diakov and Diacov. Notable people with the surname include:
Anatoly Dyakov, former head of RAO UES, the largest electric power holding company in Russia
Bogomil Dyakov, Bulgarian soccer player
Dumitru Diacov Moldovan politician of Russian ethnicity
Ilia Dyakov, Bulgarian soccer player
Kostadin Dyakov, Bulgarian soccer player
Sergey Dyakov, several people
Seva Dyakov, former MTV VJ
Svetoslav Dyakov, Bulgarian soccer player
Tanko Dyakov, Bulgarian soccer player
Vitali Dyakov, Russian soccer player
