A singer-songwriter is a musician who writes, composes, and performs their own musical material, including lyrics and melodies. In the United States, the category is built on the folk-acoustic tradition with a guitar, although this role has transmuted through different eras of popular music. Traditionally, these musicians would write and sing songs personal to them. Singer-songwriters often provide the sole musical accompaniment to an entire song. The piano is also an instrument of choice.

The label "singer-songwriter" (or "song-writer/singer") is used by record labels and critics to define popular music artists who write and perform their own material, which is often self-accompanied – generally on acoustic guitar or piano. Such an artist performs the roles of composer, lyricist, vocalist, sometimes instrumentalist, and often self-manager. According to AllMusic, singer-songwriters' lyrics are often personal but veiled by elaborate metaphors and vague imagery, and their creative concern is to place emphasis on the song rather than on their performance of it. Most records by such artists have a similarly straightforward and spare sound that places emphasis on the song itself.

The term may also characterise songwriters in the rock, folk, country, and pop-music genres – including Henry Russell (1812–1900), Aristide Bruant (1851–1925), Hank Williams (1923–1953), and Buddy Holly (1936–1959). The phrase "singer-songwriter", recorded from 1949, came into popular usage from the 1960s onwards to describe songwriters who followed particular stylistic and thematic conventions, particularly lyrical introspection, confessional songwriting, mild musical arrangements, and an understated performing style. According to writer Larry David Smith, because it merged the roles of composer, writer, and singer, the popularity of the singer-songwriter phenomenon reintroduced the Medieval troubadour tradition of "songs with public personalities" after the Tin Pan Alley era in American popular music. Song topics of singer-songwriters from the American folk music revival include political protest, as in the case of Woody Guthrie (1912–1967) and Pete Seeger (1919–2014). According to the

Journal of Popular Music Studies, from the folk revival and onward into its permanence in pop music, the role of a singer-songwriter has involved several dimensions of creative identity:

The first aesthetic layer encourages songwriters to sing and perform their own works and to instill their own stylistic flavors into the song texts. The songwriters are not independent from the works once they are finished; rather, they enter into, activate, and authenticate the song texts through their vocal and musical performances. While the first layer does not always require the singer to be the songwriter, the second sociological layer not only fixates on the relationship between singer and songwriter (in this case, singer-songwriter is often hyphenated instead of using a slash between singer and songwriter), but also solicits more sociological agency aside from singing and songwriting, such as arranging, mixing, producing, collaborating, and media management. In other words, a singer-songwriter thus undergoes a thickening process involving two-layered voices, including performing stylistic persona, amassing other voices, and coordinating other sociological skills. This thickening process demonstrates the fluid, multiple, and heterogeneous voices underneath the singular authorial image, thus complicating the notion of authorship for singer-songwriters.

The concept of a singer-songwriter can be traced to ancient bardic oral tradition, which has existed in various forms throughout the world. Poems would be performed as chant or song, sometimes accompanied by a harp or other similar instrument. After the invention of printing, songs would be written and performed by ballad sellers. Usually these would be versions of existing tunes and lyrics, which were constantly evolving. This developed into the singer-songwriting traditions of folk culture.

Traveling performers existed throughout Europe. Thus, the folklorist Anatole Le Braz gives a detailed account of one ballad singer, Yann Ar Minouz, who wrote and performed songs traveling through Brittany in the late nineteenth century and selling printed versions.

In large towns it was possible to make a living performing in public venues, and with the invention of phonographic recording, early singer-songwriters like Théodore Botrel, George M. Cohan, and Hank Williams became celebrities; radio further added to their public recognition and appeal.