The Symphony No. 3 in C minor, Op. 78, was completed by Camille Saint-Saëns in 1886 at the peak of his artistic career. It is popularly known as the Organ Symphony, since, unusually for a late-Romantic symphony, two of the four sections use the pipe organ. The composer inscribed it as: Symphonie No. 3 "avec orgue".

Charles-Camille Saint-Saëns was a French composer, organist, conductor and pianist of the Romantic era. His best-known works include Introduction and Rondo Capriccioso (1863), the Second Piano Concerto (1868), the First Cello Concerto (1872), Danse macabre (1874), the opera Samson and Delilah (1877), the Third Violin Concerto (1880), the Third ("Organ") Symphony (1886) and The Carnival of the Animals (1886).