Sonatas, duos and fantasies by Franz Schubert include all works for solo piano by Franz Schubert, except separate dances. They also include a number of works for two players: piano four hands, or piano and a string instrument (violin, arpeggione).

Sonatas for piano solo Twenty-four extant sonatas and sonata fragments are listed in the 1978 version of the Deutsch catalogue: D. 154, Piano Sonata in E major (1815, fragment; similarity with the first movement of the Piano Sonata in E major, D. 157) I. Allegro (fragment) D. 157, Piano Sonata in E major (1815, unfinished – first three movements are extant) I. Allegro ma non troppo II. Andante III. Menuetto. Allegro vivace – Trio D. 279, Piano Sonata in C major (1815, unfinished – first three movements are extant; the Allegretto in C major, D. 346 fragment is probably the fourth movement) I. Allegro moderato II. Andante III. Menuetto. Allegro vivace – Trio IV. Allegretto (D. 346, fragment) D. 459, Piano Sonata in E major (1816, in 2 movements; also paired with D. 459A to have a five movement sonata or five piano pieces "Fünf Klavierstücke") I. Allegro moderato II. Scherzo. Allegro D. 459A, Three piano pieces "Drei Klavierstücke" (1816?, also paired with D. 459 to have a five movement sonata or five piano pieces "Fünf Klavierstücke" III. Adagio IV. Scherzo. Allegro – Trio. Più tardo V. Allegro patetico D. 537, Piano Sonata in A minor (1817, first published as Op. posth. 164) I. Allegro ma non troppo II. Allegretto quasi andantino III. Allegro vivace D. 557, Piano Sonata in A major (1817; there is not complete certainty that the third movement, in E major, is the Finale of the work) I. Allegro moderato II. Andante III. Allegro D. 566, Piano Sonata in E minor (1817, unfinished? – first three movements are extant; the Rondo in E major, D. 506 is probably the fourth movement) I. Moderato II. Allegretto III. Scherzo. Allegro vivace – Trio IV. Rondo. Allegretto (D. 506) D. 568, Piano Sonata in D major/E major (1817, 2 versions; for the 1st version, the Scherzo in D major, D. 593 No. 2 possibly constitutes the third movement; the last movement is a fragment; NSA also appends an amended first movement from the 1st version; 2nd version first published as Op. posth. 122) 1st version, in D major [formerly D. 567] I. Allegro moderato II. Andante molto III. Scherzo. Allegro moderato – Trio (D. 593 No. 2) IV. Allegretto (fragment) 2nd version, in E major I. Allegro moderato II. Andante molto III. Menuetto. Allegro – Trio IV. Allegro moderato D. 571, Piano Sonata in F minor (1817, unfinished – fragment of an "Allegro moderato" first movement is extant. The Piano piece in A major, D. 604, an Andante, as well as the Scherzo in D major and Allegro in F minor fragment from D. 570 probably constitute the remaining movements) I. Allegro moderato (fragment) II. Andante (D. 604) III. Scherzo. Allegro vivace – Trio (D. 570) IV. Allegro (D. 570, fragment) D. 575, Piano Sonata in B major (1817, first published as Op. posth. 147) I. Allegro, ma non troppo II. Andante III. Scherzo. Allegretto – Trio IV. Allegro giusto D. 613, Piano Sonata in C major (1818, unfinished – fragments of two movements are extant; the Adagio in E major, D. 612 as well as the Minuet with Trio D. 600/610 possibly constitute the remaining movements) I. Moderato (fragment) II. Adagio (D. 612) III. Menuetto – Trio (D. 600/610) IV. Without tempo indication (fragment) D. 625, Piano Sonata in F minor (1818, unfinished – a completed Scherzo with Trio, and fragments of two "Allegro" movements are extant; the Adagio in D major D. 505 is probably the second movement) I. Allegro (fragment) II. Adagio (D. 505) III. Scherzo. Allegretto – Trio IV. Allegro (fragment) D. 655, Piano Sonata in C minor (1819, fragment) I. Allegro (fragment) D. 664, Piano Sonata in A major, Little A major (1819 or 1825, first published as Op. posth. 120) I. Allegro moderato II. Andante III. Allegro D. 769A, Piano Sonata in E minor [formerly D. 994] (ca. 1823, fragment) I. Allegro (fragment) D. 784, Piano Sonata in A minor, Grande Sonate (1823, first published as Op. posth. 143) I. Allegro giusto II. Andante III. Allegro vivace D. 840, Piano Sonata in C major, Reliquie (1825, unfinished – first and second movements are complete; third and fourth movements are fragments) I. Moderato II. Andante III. Menuetto. Allegretto – Trio (fragment) IV. Rondo. Allegro (fragment) D. 845, Piano Sonata in A minor (1825, first published as Op. 42) I. Moderato II. Andante poco mosso III. Scherzo. Allegro vivace – Trio. Un poco più lento IV. Rondo. Allegro vivace D. 850, Piano Sonata in D major, Gasteiner (1825, first published as Op. 53) I. Allegro II. Con moto III. Scherzo. Allegro vivace – Trio IV. Rondo. Allegro moderato D. 894, Piano Sonata in G major, Fantasie (1826, first published as Op. 78; NSA also appends a discarded 1st version of the second movement) I. Molto moderato e cantabile II. Andante III. Menuetto. Allegro moderato – Trio IV. Allegretto D. 958, Piano Sonata in C minor (1828) I. Allegro II. Adagio III. Menuetto. Allegro – Trio IV. Allegro D. 959, Piano Sonata in A major (1828) I. Allegro II. Andantino III. Scherzo. Allegro vivace – Trio. Un poco più lento IV. Rondo. Allegretto D. 960, Piano Sonata in B major (1828) I. Molto moderato II. Andante sostenuto III. Scherzo. Allegro vivace e con delicatezza – Trio IV. Allegro, ma non troppo

There are also some possibly lost piano sonatas: D Anh. I/8, Piano Sonata in F major (1815, lost or identical to D. 157) D Anh. I/9, Piano Sonata in F major (1816, lost or identical to D. 459) D deest, Piano Sonata in C major (1825?, lost or identical to D. 568 1st version)

Piano compositions that possibly were intended as piano sonata movements: D. 277A, Minuet in A minor with Trio in F major for piano (1815, alternate third movement for the Piano Sonata in C major, D. 279) D. 346, Allegretto in C major for piano (1816?, fragment; probably the fourth movement of the Piano Sonata in C major, D. 279) D. 505, Adagio in D major for piano (1818?, probably the second movement of the unfinished Piano Sonata in F minor, D. 625; first published in E major in an abridged form as Op. posth. 145 No. 1) D. 506, Rondo in E major for piano (1817?, probably the fourth movement of the unfinished? Piano Sonata in E minor, D. 566; first published as Op. posth. 145 No. 2) D. 570, Scherzo in D major and Allegro in F minor for piano (1817?, the "Allegro" is a fragment; these were probably intended as the third and fourth movements, respectively, of the unfinished Piano Sonata in F minor, D. 571) D. 593, Two Scherzi for piano (1817): No. 2, Allegro moderato in D major (possibly the third movement of the unfinished Sonata in D major, D. 568 [1st version, formerly D. 567]) D. 600, Minuet in C minor for piano (1814?; the Trio in E major, D. 610 was probably intended for this Minuet; in turn the Minuet with Trio D. 600/610 tandem possibly constitute the third movement of the unfinished Piano Sonata in C major, D. 613) D. 604, Piano piece in A major (1816 or 1817; also appears as "Andante in A major"; probably the second movement of the unfinished Piano Sonata in F minor, D. 571) D. 610, Trio in E major for piano, to be regarded as the lost son of a minuet (1818, this Trio was probably intended for the Minuet in C minor, D. 600; in turn the Minuet with Trio D. 600/610 tandem possibly constitute the third movement of the unfinished Piano Sonata in C major, D. 613) D. 612, Adagio in E major for piano (1818, probably the second movement of the unfinished Piano Sonata in C major, D. 613)

Distinction between complete and incomplete piano sonatas

Complete sonatas These works are by all accounts complete and have always been taken as such: D. 537, Piano Sonata in A minor (1817, first published as Op. posth. 164) D. 568, Piano Sonata E major (1825-1826?, 2nd version; first published as Op. posth. 122) D. 575, Piano Sonata in B major (1817, first published as Op. posth. 147) D. 664, Piano Sonata in A major, Little A major (1819 or 1825, first published as Op. posth. 120) D. 784, Piano Sonata in A minor, Grande Sonate (1823, first published as Op. posth. 143) D. 845, Piano Sonata in A minor (1825, first published as Op. 42) D. 850, Piano Sonata in D major, Gasteiner (1825, first published as Op. 53) D. 894, Piano Sonata in G major, Fantasie (1826, first published as Op. 78) D. 958, Piano Sonata in C minor (1828) D. 959, Piano Sonata in A major (1828) D. 960, Piano Sonata in B major (1828)

Possibly complete sonatas The works listed below are considered complete or incomplete, depending on source: D. 157, Piano Sonata in E major (1815, three movements extant) D. 459 and D. 459A, Piano Sonata in E major (1816 and 1816?; D. 459 is a Sonata in two movements; it is usually paired with the "Three piano pieces" ["Drei Klavierstücke"], D. 459A to have either a five movement sonata or the work as it appeared in its first edition: "Five piano pieces" ["Fünf Klavierstücke"]) D. 557, Piano Sonata in A major (1817; there is not complete certainty that the third movement, in E major, is the Finale of the work) D. 566, Piano Sonata in E minor (1817, unfinished? – first three movements are extant; the Rondo in E major, D. 506 is probably the fourth movement)

Incomplete sonatas and sonata fragments They can be divided into the following categories: Unfinished sonatas with certainty about all intended movements There is no doubt about the movements Schubert intended for the following sonata: D. 840, Piano Sonata in C major, Reliquie (1825, unfinished – first and second movements are complete; third and fourth movements are fragments) Unfinished sonatas that have independent movements associated with them The five works listed below are by all accounts unfinished, but have independent movements (either complete or fragments) that are generally accepted as forming part of their structure: D. 279, Piano Sonata in C major (1815, unfinished – first three movements are extant; the Allegretto in C major, D. 346 fragment is probably the fourth movement) D. 568, Piano Sonata in D major (1817, 1st version; the last movement is a fragment; the Scherzo in D major, D. 593 No. 2Paul Badura-Skoda, ed. Klaviersonaten, Volume III. München: G. Henle Verlag, 1979-1989: V. Badura-Skoda states that "the Scherzo in D-flat major [...], the Trio of which is almost identical with the Trio of the Minuet of the E-flat major Sonata D 568, belongs most likely to the D-flat major Sonata, D 567, to be inserted before or after the Andante." possibly constitutes the third movement) D. 571, Piano Sonata in F minor (1817, unfinished – fragment of an "Allegro moderato" first movement is extant. The piano piece in A major, D. 604, an Andante, as well as the Scherzo in D major and Allegro in F minor fragment from D. 570 probably constitute the remaining movements) D. 613, Piano Sonata in C major (1818, unfinished – fragments of two movements are extant; the Adagio in E major, D. 612 as well as the Minuet with Trio D. 600/610Eva Badura-Skoda and Peter Branscombe. Schubert Studies: Problems of Style and Chronology. Cambridge University Press, 1982: 314. While the Adagio, D 612 has generally been regarded as the slow movement to this sonata, the suggestion of D 600/610 as the third movement has not carried as much weight. This inclusion was suggested by Reinhard van Hoorickx, who states that "it is not impossible that the Minuet in C sharp minor (D 600) and the Trio in E major (D 610) may also have been originally intended for this sonata: they would certainly fit in with the characteristic Schubertian key-scheme." possibly constitute the remaining movements)