A multi-millionaire Russian businessman has been shot dead at his mansion, the latest elite with links to energy giant Gazprom to die in recent months.

Yuri Voronov, 61, head of a logistics company that held lucrative contracts with Gazprom in the Arctic, was found dead at his home in an ultra-wealthy suburb of St Petersburg around 2pm Monday.

Voronov was found floating in the swimming pool with a gunshot wound to his head, a Grand Power pistol nearby, and several spent cases at the bottom of the pool. 

He is at least the sixth wealthy Russian businessman to die in mysterious circumstances since the start of the year, many of them with links to Gazprom, and two of whom died in the same St Petersburg suburb as Voronov.