Rayo is an abbreviation of Rayo Vallecano, a Spanish professional football club.
Rayo or rayo may also refer to:
Rayo (album), by J Balvin (2024) Rayo (name) Rayo's number, a large number named after Agustín Rayo Rayo(n), the smallest k greater than all numbers Rayo-nameable in at most n symbols Rayo (streaming), a streaming media service from Bauer Media Audio UK