Nannie "Nan" Bagby Stephens (1883 – December 29, 1946) was an American playwright and composer, best known for the libretto of Cabildo (1932), an opera, with music by Amy Beach.

[4] She graduated from Girls High School in Atlanta and Agnes Scott College,[5] and trained as a pianist in Vienna with Johanna Müller and Theodor Leschetizky.

[6] Stephens, who was white, was known for writing songs and plays based on traditional "negro music" of the American South, often with regional themes and dialect lyrics.

[13] Stephens was a vice-president of the National Federation of Music Clubs, representing the South Atlantic states,[14] and taught play writing at Agnes Scott College in the late 1920s.

[5] Her 1932 collaboration with composer Amy Beach, a one-act opera named Cabildo, about a prison in New Orleans, was first recorded in 1965,[27] and saw its first professional production in 1995, at Lincoln Center.