The Piano Sonata No. 2 in B♭ minor, Op. 35, is a piano sonata in four movements by Polish composer Frédéric Chopin. Chopin completed the work while living in George Sand's manor in Nohant, some 250 km (160 mi) south of Paris, a year before it was published in 1840. The first of the composer's three mature sonatas, the work is considered to be one of the greatest piano sonatas of the literature.