Wolfgang Amadeus Mozart  was a prolific composer and wrote in many genres.
Perhaps his best-admired work is in opera, the piano concerto and sonata, the symphony, and in the string quartet and string quintet.
Mozart also wrote much work for solo piano, other forms of chamber music, masses and other religious music, and numerous dances, divertimentos, and other forms of light entertainment.

How Mozart's compositions are listed. The indication "K." or "KV" refers to Köchel Verzeichnis (Köchel catalogue), i.e. the (more or less) chronological (i.e. by composition date) catalogue of Mozart's works by Ludwig von Köchel. This catalog has been amended several times, leading to ambiguity over some KV numbers.
The compositions of Mozart listed below are grouped thematically, i.e. by type of composition. Not all thematic groups of Mozart's works have a separate numbering that is generally accepted: Köchel only numbers symphonies (1 to 41), piano concertos (1 to 27, leaving out some early transcriptions by Mozart) and a few other groups. On the other hand, for most chamber music and vocal music there is no such numbering (or at least no generally accepted one).
Only relatively few of Mozart's compositions have opus numbers, as not so many of his compositions were published during his lifetime, so numbering by opus number proves quite impractical for Mozart compositions.