Symphony No. 23 may refer to:
Symphony No. 23 (Brian) by Havergal Brian, 1965 Symphony No. 23 (Haydn) in G major (Hoboken I/23) by Joseph Haydn, 1764 Symphony No. 23 (Michael Haydn) in D major (Perger 43, Sherman 22, MH 287) by Michael Haydn, c. 1779 Symphony No. 23 (Mozart) in D major (K. 181/162b) by Wolfgang Amadeus Mozart, 1773 Symphony No. 23 (Myaskovsky) in A minor (Op. 56, Symphony-Suite on Kabardanian Themes) by Nikolai Myaskovsky, 1941