Kazimierz Serocki's Sonatina for piano is presented for the first time in print. Composed in 1949, it received an honorable mention at the 2 Fryderyk Chopin Composers' Competition organized by the polish Composers' Union. This three-movement composition, a sonically interesting showpiece, combines folkloric elements with modern musical language. Bold harmonizations, elements of polyphony, especially in the second movement allude to the ideas of Sergei Prokofiev and Bela Bartok. The compositions is the first of Serocki's works to attest to his interest in the folkloric trend, wich continued in his later oeuvre.