Petr Petrovich Elfimov (Belarusian: Пётр Ялфімаў, Piotr Jalfimaŭ, Russian: Пётр Елфимов, Pyotr Yelfimov) is a singer from Belarus who represented his nation at the Eurovision Song Contest 2009 in Moscow, Russia.

He won the national selection of Belarus on 19 January 2009 with the rock/pop song Eyes That Never Lie.

On 16 May it failed to win a place in the final, finishing 13th of 18 acts, receiving a total of 25 points.

In 2019, Petr Elfimov was the opening singer for 2019 European Games held in Minsk, Belarus along with Alyona Lanskaja.

In 2018, Elfimov joined Heavy metal band Grand Courage as vocalist.