Peter Breiner (born July 3, 1957 in Humenné, in former Czechoslovakia, present day Slovakia) is a Slovak pianist, conductor, and composer.

Breiner began to play and study the piano at age four. At age nine, he started to study at the Conservatory in Košice, Slovakia (where he studied piano, percussion, composition and conducting). He subsequently moved to Bratislava, Slovakia where he attended the Academy of Performing Arts continuing his composition studies under the tuition of Alexander Moyzes; he was graduated from the Academy in 1982.