A suite, in Western classical music, is an ordered set of instrumental or orchestral/concert band pieces. It originated in the late 14th century as a pairing of dance tunes; and grew in scope so that by the early 17th century it comprised up to five dances, sometimes with a prelude. The separate movements were often thematically and tonally linked. The term can also be used to refer to similar forms in other musical traditions, such as the Turkish fasıl and the Arab nuubaat.

In the Baroque era, the suite was an important musical form, also known as Suite de danses, Ordre (the term favored by François Couperin), Partita, or Ouverture (after the theatrical "overture" which often included a series of dances) as with the orchestral suites of Christoph Graupner, Telemann and J.S. Bach.

During the 18th century, the suite fell out of favour as a cyclical form, giving way to the symphony, sonata and concerto. It was revived in the later 19th century, but in a different form, often presenting extracts from a ballet (Nutcracker Suite), the incidental music to a play (L'Arlésienne, Masquerade), opera, film (Lieutenant Kije Suite) or video game (Motoaki Takenouchi's 1994 suite to the Shining series), or entirely original movements (Holberg Suite, The Planets).

Estienne du Tertre published suyttes de bransles in 1557, giving the first general use of the term "suite" 'suyttes' in music, although the usual form of the time was as pairs of dances. The first recognizable suite is Peuerl's Newe Padouan, Intrada, Dantz, and Galliarda of 1611, in which the four dances of the title appear repeatedly in ten suites. The Banchetto musicale by Johann Schein (1617) contains 20 sequences of five different dances. The first four-movement suite credited to a named composer, Sandley's Suite, was published in 1663.

The Baroque suite consisted of allemande, courante, sarabande, and gigue, in that order, and developed during the 17th century in France, the gigue appearing later than the others. Johann Jakob Froberger is usually credited with establishing the classical suite through his compositions in this form, which were widely published and copied, although this was largely due to his publishers standardizing the order; Froberger's original manuscripts have many different orderings of the movements, e.g. the gigue preceding the sarabande. The publisher's standardized order was, however, highly influential especially on the works of Bach.

Many later suites included other movements placed between sarabande and gigue. These optional movements were known as galanteries: common examples are the minuet, gavotte, passepied, and bourrée. Often there would be two contrasting galanteries with the same name, e.g. Minuet I and II, to be played alternativement, meaning that the first dance is played again after the second (but without the internal repeats), thus I, II, I.

The later addition of an overture to make up an "overture-suite" was extremely popular with German composers; Telemann claimed to have written over 200 overture-suites, Christoph Graupner wrote 86 orchestral overture-suites and 57 partitas for harpsichord, J.S. Bach had his four orchestral suites along with other suites, and Handel put his Water Music and Music for the Royal Fireworks in this form. Handel wrote 22 keyboard suites; Bach produced multiple suites for lute, cello, violin, flute, and other instruments, as well as English suites, French suites and Partitas for keyboard. François Couperin's later suites (which he called "Ordres") often dispensed entirely with the standard dances and consisted entirely of character pieces with fanciful names.

By the 1750s, the suite had come to be seen as old-fashioned, superseded by the symphony and concerto, and few composers were still writing suites during that time. But since the 19th century, composers have frequently arranged ballets, operas, and other works into suites for concert performance. Arrangement into a suite can make the music more accessible and available to a wider audience, and has greatly helped popularize the music itself, such as in Tchaikovsky's suite from The Nutcracker, or Aaron Copland's suite from Appalachian Spring. Suites for orchestra or concert band usually consist of one or more movements. An example is Grieg's Peer Gynt Orchestral Suites I and II, each consisting of four movements. Such suites may consist of