Beethoven Compositions by Opus numbers

Opus 1:  Three Piano Trios  (1795)
     No. 1:  Piano Trio No. 1 in E♭ major
     No. 2:  Piano Trio No. 2 in G major
     No. 3:  Piano Trio No. 3 in C minor

Opus 2: Three Piano Sonatas  (1796)
     No. 1:  Piano Sonata No. 1 in F minor  compare to Op. 10.2
     No. 2:  Piano Sonata No. 2 in A major
     No. 3:  Piano Sonata No. 3 in C major

Opus 3:  String Trio No. 1 in E♭ major  (1794) 

Opus 4:  String Quintet  (Reworking of Wind Octet (Op. 103), 1795)

Opus 5:  Two Cello Sonatas  (1796)
     No. 1:  Cello Sonata No. 1 in F major
     No. 2:  Cello Sonata No. 2 in G minor

Opus 6:  Sonata for Piano, Four Hands in D major  (1797)

Opus 7:  Piano Sonata No. 4 in E♭ major  (1797)  "Grand"

Opus 8:  String Trio No. 2 (Serenade) in D major  (1797)

Opus 9:  Three String Trios  (1798)
     No. 1:  String Trio No. 3 in G major
     No. 2:  String Trio No. 4 in D major
     No. 3:  String Trio No. 5 in C minor

Opus 10:  Three Piano Sonatas  (1798)
     No. 1:  Piano Sonata No. 5 in C minor  ???
     No. 2:  Piano Sonata No. 6 in F major  compare to Op. 2.1
     No. 3:  Piano Sonata No. 7 in D major

Opus 11:  Piano Trio No. 4 in B♭ major ("Gassenhauer")  (1797)
               (*for clarinet (or violin), cello (sometimes bassoon), and piano)

Opus 12:  Three Violin Sonatas  (1798)
     No. 1:  Violin Sonata No. 1 in D major
     No. 2:  Violin Sonata No. 2 in A major
     No. 3:  Violin Sonata No. 3 in E♭ major

Opus 13:  Piano Sonata No. 8 in C minor ("Pathetique")  (1799)

Opus 14:  Two Piano Sonatas  (1799)
     No. 1:  Piano Sonata No. 9 in E major (arr. for String Quartet by L.v.B. in F major, H
34, in 1801)
     No. 2:  Piano Sonata No. 10 in G major

Opus 15:  Piano Concerto No. 1 in C major

Opus 16:  Quintet for Piano and Winds  (1796) (later arranged for piano quartet)

Opus 17:  Horn Sonata in F major  (1800)

Opus 18:  Six String Quartets  (1800)
     No. 1:  String Quartet No. 1 in F major
     No. 2:  String Quartet No. 2 in G major
     No. 3:  String Quartet No. 3 in D major
     No. 4:  String Quartet No. 4 in C minor
     No. 5:  String Quartet No. 5 in A major
     No. 6:  String Quartet No. 6 in B♭ major

Opus 19:  Piano Concerto No. 2 in B♭ major  (1795)

Opus 20:  Septet in E♭ major  (1799)  (Huge pop success)

Opus 21:  Symphony No. 1 in C major  (1800)

Opus 22:  Piano Sonata No. 11 in B♭ major  (1800)

Opus 23:  Violin Sonata No. 4 in A minor  (1801)

Opus 24:  Violin Sonata No. 5 in F major ("Spring")  (1801)

Opus 25:  Serenade for Flute, Violin and Viola in D major  (1801)

Opus 26:  Piano Sonata No. 12 in A♭ major   (1801)

Opus 27:  Two Piano Sonatas  (1801)
     No. 1:  Piano Sonata No. 13 in E♭ major
     No. 2:  Piano Sonata No. 14 in C♯ minor ("Moonlight")

Opus 28:  Piano Sonata No. 15 in D major ("Pastoral")  (1801)

Opus 29:  String Quintet in C major  (1801)

Opus 30:  Three Violin Sonatas  (1803)
     No. 1:  Violin Sonata No. 6 in A major
     No. 2:  Violin Sonata No. 7 in C minor
     No. 3:  Violin Sonata No. 8 in G major

Opus 31:  Three Piano Sonatas  (1802)
     No. 1:  Piano Sonata No. 16 in G major
     No. 2:  Piano Sonata No. 17 in D minor ("Tempest")
     No. 3:  Piano Sonata No. 18 in E♭ major ("Hunt")

Opus 32:  Song "An die Hoffnung"  (1805)

Opus 33:  Seven Bagatelles for piano  (1802)

Opus 34:  Six variations on an original theme for piano in F major  (1802)

Opus 35:  15 variations and a fugue for piano on an original theme in E♭ major ("Eroica Variations")  (1802)

Opus 36:  Symphony No. 2 in D major  (1803)

Opus 37:  Piano Concerto No. 3 in C minor  (c. 1800)

Opus 38:  Piano Trio in E♭ major (arrangement of the Septet, Opus 20)  (1803)

Opus 39:  Two Preludes through all twelve major keys for piano  (1789)

Opus 40:  Romance for Violin and Orchestra No. 1 in G major  (1802)

Opus 41:  Serenade for Piano and Flute or Violin in D major  (1803)

Opus 42:  Notturno for Viola and Piano in D major (1803)

Opus 43:  The Creatures of Prometheus, overture and ballet music  (1801)

Opus 44:  Variations on an original theme in E♭ major for piano trio  (1792)

Opus 45:  Three Marches for Piano, 4 hands (1803)

Opus 46:  Song – "Adelaide" (1795)

Opus 47:  Violin Sonata No. 9 in A major ("Kreutzer")  (1803)

Opus 48:  Six Songs (1802)
     No. 1:  "Bitten"
     No. 2:  "Die Liebe des Nächsten"
     No. 3:  "Vom Tode"
     No. 4:  "Die Ehre Gottes aus der Natur"
     No. 5:  "Gottes Macht und Vorsehung"
     No. 6:  "Bußlied"

Opus 49:  Two Piano Sonatas  (between 1795 and 1798)
     No. 1:  Piano Sonata No. 19 in G minor
     No. 2:  Piano Sonata No. 20 in G major

Opus 50:  Romance for Violin and Orchestra No. 2 in F major  (1798)

Opus 51:  Two Rondos for Piano  (1797)
     No. 1:  Rondo in C major
     No. 2:  Rondo in G major

Opus 52:  Eight Songs (1804–1805)
     No. 1:  "Urians Reise um die Welt"
     No. 2:  "Feuerfarb'"
     No. 3:  "Das Liedchen von der Ruhe"
     No. 4:  "Maigesang"
     No. 5:  "Mollys Abschied"
     No. 6:  "Die Liebe"
     No. 7:  "Marmotte"
     No. 8:  "Das Blümchen Wunderhold"

Opus 53:  Piano Sonata No. 21 in C major  ("Waldstein")  (1803)

Opus 54:  Piano Sonata No. 22 in F major  (1804)

Opus 55:  Symphony No. 3 in E♭ major  ("Eroica")  (1805)

Opus 56:  Triple Concerto for violin, cello, and piano in C major  (1804–1805)

Opus 57:  Piano Sonata No. 23 in F minor  ("Appassionata")  (1805–1806)

Opus 58:  Piano Concerto No. 4 in G major  (1805–1806)

Opus 59:  Three String Quartets  ("Rasumovsky")  (1806)
     No. 1:  String Quartet No. 7 in F major
     No. 2:  String Quartet No. 8 in E minor
     No. 3:  String Quartet No. 9 in C major

Opus 60:  Symphony No. 4 in B♭ major  (1806)

Opus 61:  Violin Concerto in D major  (1806)

Opus 61a:  Piano Transcription of Violin Concerto, Opus 61

Opus 62:  Coriolan Overture  (1807)

Opus 63:  Arrangement of String Quintet (Opus 4) for Piano Trio  (1806)  (doubtful)

Opus 64:  Arrangement of String Trio (Opus 3) for Piano and Cello  (1807)  (spurious – author unknown)

Opus 65:  Aria: "Ah! perfido"  (1796)

Opus 66:  12 Variations for cello and piano in F major on Mozart's "Ein Mädchen oder Weibchen"  (1796)

Opus 67:  Symphony No. 5 in C minor  (1807–1808)

Opus 68:  Symphony No. 6 in F major  ("Pastoral")  (1807–1808)

Opus 69:  Cello Sonata No. 3 in A major  (1808)

Opus 70:  Two Piano Trios  (1808)
      No. 1:  Piano Trio No. 5 in D major ("Ghost")
      No. 2:  Piano Trio No. 6 in E♭ major

Opus 71:  Wind sextet in E♭  (1796)

Opus 72:  Fidelio, opera  (c. 1803–05; Fidelio Overture composed 1814)

Opus 72a:  Leonore (earlier version of Fidelio, with Leonore Overture No. 2)  (1805)

Opus 72b:  Leonore (earlier version of Fidelio, with Leonore Overture No. 3)  (1806)

Opus 73:  Piano Concerto No. 5 in E♭ major ("Emperor") (1809)

Opus 74:  String Quartet No. 10 in E♭ major ("Harp")  (1809)

Opus 75:  Six Songs  (1809)
     No. 1:  "Mignon"
     No. 2:  "Neue Liebe neues Leben"
     No. 3:  "Es war einmal ein König" from Goethe's Faust; also known as "Song of the Flea"
     No. 4:  "Gretels Warnung"
     No. 5:  "An die fernen Geliebten"
     No. 6:  "Der Zufriedene"

Opus 76:  Six variations on an original theme for piano in D major  (1809)

Opus 77:  Piano Fantasia in G minor  (1809)

Opus 78:  Piano Sonata No. 24 in F♯ major  (1809)

Opus 79:  Piano Sonata No. 25 in G major  (1809)

Opus 80:  "Choral Fantasy"  (Fantasia in C minor for piano, chorus, and orchestra)  (1808)

Opus 81a:  Piano Sonata No. 26 in E♭ major  ("Les Adieux")  (1809)

Opus 81b:  Sextet in E♭ major  (1795)

Opus 82:  Four Ariettas and a Duet  (1809)
     No. 1:  "Dimmi, ben mio, che m'ami"
     No. 2:  "T'intendo si, mio cor"
     No. 3:  "L'amante impaziente" (first version)
     No. 4:  "L'amante impaziente" (second version)
     No. 5:  Duet: "Odi 'laura che dolce sospira"

Opus 83:  Three Songs  (1810)
     No. 1:  "Wonne der Wehmut"
     No. 2:  "Sehnsucht"
     No. 3:  "Mit einem gemalten Band"

Opus 84:  Egmont, overture and incidental music  (1810)

Opus 85:  Oratorio: Christus am Ölberge (Christ on the Mount of Olives)  (1803)

Opus 86:  Mass in C major  (1807)

Opus 87:  Trio for two Oboes and English Horn in C major  (1795)

Opus 88:  Song: "Das Glück der Freundschaft"  (1803)

Opus 89:  Polonaise in C major  (1814)

Opus 90:  Piano Sonata No. 27 in E minor  (1814)

Opus 91:  Wellington's Victory  ("Battle Symphony")  (1813)

Opus 92:  Symphony No. 7 in A major  (1812)

Opus 93:  Symphony No. 8 in F major  (1812)

Opus 94:  Song "An die Hoffnung" (1814)

Opus 95:  String Quartet No. 11 in F minor  ("Serioso")  (1810)

Opus 96:  Violin Sonata No. 10 in G major  (1812)

Opus 97:  Piano Trio No. 7 in B♭ major ("Archduke")  (1811)

Opus 98:  An die ferne Geliebte, song cycle  (1816)

Opus 99:  Song "Der Mann von Wort"  (1816)

Opus 100:  Song "Merkenstein"  (1814, about the Merkenstein ruins)

Opus 101:  Piano Sonata No. 28 in A major  (1816)  (Harmonic instability)

Opus 102:  Two Cello Sonatas  (1815)
     No. 1:  Cello Sonata No. 4 in C major
     No. 2:  Cello Sonata No. 5 in D major.

Opus 103:  Octet in E♭  (1792)

Opus 104:  String Quintet  (arrangement of Piano Trio No. 3, 1817)

Opus 105:  Six sets of variations for Piano and Flute  (1819)

Opus 106:  Piano Sonata No. 29 in B♭ major  ("Hammerklavier")  (1818)

Opus 107:  Ten National Airs with Variations for Flute and Piano  (1820)

Opus 108:  Twenty-Five Scottish Songs  (1818)

Opus 109:  Piano Sonata No. 30 in E major  (1820)

Opus 110:  Piano Sonata No. 31 in A♭ major  (1821)

Opus 111:  Piano Sonata No. 32 in C minor  (1822)

Opus 112:  Meeresstille und glückliche Fahrt (Calm Sea & Prosperous Voyage), for chorus and orch. (1815)

Opus 113:  Die Ruinen von Athen (The ruins of Athens), overture and incidental music  (1811)

Opus 114:  Die Ruinen von Athen (The ruins of Athens), March and Chorus  (1822).

Opus 115:  Zur Namensfeier (Feastday), overture  (1815)

Opus 116:  "Tremate, empi tremate", vocal trio with orchestra  (1802)

Opus 117:  König Stephan (King Stephen), overture and incidental music  (1811)

Opus 118:  "Elegischer Gesang" for four voices and string quartet  (1814)

Opus 119:  Eleven new Bagatelles for piano  (1822)

Opus 120:  33 variations on a waltz by Diabelli for piano in C major ("Diabelli Variations")  (1823)

Opus 121a:  Kakadu Variations, for Piano Trio (Variations on "Ich bin der Schneider Kakadu") (1803)

Opus 121b:  "Opferlied" for soprano, chorus and orchestra  (1822)

Opus 122:  "Bundeslied" for voices, chorus and wind instruments  (1824)

Opus 123:  Missa solemnis in D major  (1823)

Opus 124:  Die Weihe des Hauses (The Consecration of the House), overture  (1822)

Opus 125:  Symphony No. 9 in D minor ("Choral")  (1824)

Opus 126:  Six Bagatelles for piano  (1824)

Opus 127:  String Quartet No. 12 in E♭ major (1825)

Opus 128:  Song: "Der Kuss"  (1822)

Opus 129:  Rondo à Capriccio for piano in G major ("Rage over a lost penny")  (1795)

Opus 130:  String Quartet No. 13 in B♭ major  (1825)

Opus 131:  String Quartet No. 14 in C♯ minor  (1826)

Opus 132:  String Quartet No. 15 in A minor  (1825)

Opus 133:  Große Fuge in B♭ major for string quartet (originally finale of Opus 130)  (1826)

Opus 134:  Piano arrangement (4 hands) of the Große Fuge, Opus 133  (1826)

Opus 135:  String Quartet No. 16 in F major  (1826)   -   Beethoven's last major work

Opus 136:  Cantata: Der glorreiche Augenblick (de)  (1814)

Opus 137:  Fugue for String Quintet in D major  (1817)

Opus 138:  Leonore, opera (earlier version of Fidelio, with Leonore Overture No. 1)  (1807)