Mitrofan Petrovich Belyayev (Russian: ???????´? ?????´??? ????´??; old style 10/22 February 1836, St.
Petersburg – 22 December 1903/ 4 January 1904) was an Imperial Russian music publisher, outstanding philanthropist, and the owner of a large wood dealership enterprise in Russia.
He was also the founder of the Belyayev circle, a society of musicians in Russia whose members included Nikolai Rimsky-Korsakov, Alexander Glazunov and Anatoly Lyadov.
His surname is often transliterated as Belaieff or Belayev.
In 1886 the important Russian painter Ilya Repin made a portrait of Belyayev.