"Cielito lindo" is a popular Mexican song from a Spanish copla, popularized in 1882 by Quirino Mendoza y Cortés. It is roughly translated as "Lovely Sweet One". Although the word "cielo" means sky or heaven, it is also a term of endearment comparable to sweetheart or honey. "Cielito", the diminutive, can be translated as "sweetie"; "lindo" means cute, lovely or pretty. Sometimes the song is known by words from the refrain, "Canta y no llores" or simply the "Ay, Ay, Ay, Ay" song.

Commonly played by mariachi bands, it has been recorded by many artists in the original Spanish as well as in English and other languages. Even though the song talks about the "Sierra Morena", a mountain range in the south region of Spain, in recent decades it has come to be widely known as a theme song for Mexico, based in the Spanish background of the country, particularly at international events, like the FIFA World Cup.