Nomos or Nomoi may refer to:

• the Greek term for "law" (, nómoi). It is the origin of the suffix -onomy, as in astronomy, economy, or taxonomy.
  • custom, traditional social norm, the equivalent of Latin Mores
  • Nomos (music), in early Greek culture, the traditional melody types used by the singer for the recitation of the epics, and all-known melody types used by citharedes and auletes in musical contests.
  • Nomos (mythology), "the spirit of law" in Greek mythology
  • Nomos (sociology), "meaningful orders or worldviews of individuals" in Peter L. Berger's sociology of religion
• the Greek νομός, meaning "pasture, field; division, distribution; district, province"
  • Nome (Egypt), a subdivisions of Ancient Egypt
  • Nome (Greece), the administrative division immediately below the peripheries of Greece (, nomoí)

-- The nouns nómos and nomós both derive from the verb νέμω, némō] to dispense or to allot, with nomós being the result of allotment and nómos being the manner of allotment or dispensing (justice).