The Cello Sonata No. 1 in D minor, Op. 109 is the first of the two cello sonatas by Gabriel Fauré. Composed in 1917 at Saint-Raphaël and Paris, it was premiered on 10 November 1917 at a concert of the Société Nationale de Musique by Gérard Hekking as the cellist and Alfred Cortot as the pianist. At the same concert, the Second Violin Sonata was also premiered. The dedicatee of the work was the cellist Louis Hasselmans, who gave a second performance at the Théâtre des Champs-Élysées in 1918.