Nomos Alpha (Greek: Νόμος α΄) is a piece for solo cello composed by Iannis Xenakis in 1965, commissioned by Radio Bremen for cellist Siegfried Palm, and dedicated to mathematicians Aristoxenus of Tarentum, Évariste Galois, and Felix Klein. This piece is an example of a style of music called, by Xenakis, symbolic music – a style of music which makes use of set theory, abstract algebra, and mathematical logic in order to create and analyze musical compositions. Along with symbolic music, Xenakis is known for his development of stochastic music.

Date of composition 1966 (1965-1966)
First published Boosey & Hawkes
Dedicated to Mathematicians Aristoxenus of Tarentum, Évariste Galois, and Felix Klein.
Approx. duration 17 minutes
Instruments Cello
Autotranslations beta Iannis Xenakis: Nomos Alpha
Iannis Xenakis: Nomos Alpha
Iannis Xenakis: Nomos Alpha