"I giorni dell'arcobaleno" ("The Days of the Rainbow") is a single by Italian singer Nicola Di Bari.

It marked the second Sanremo Festival victory in a row for Di Bari, an accomplishment only achieved by two other artists, Nilla Pizzi and Domenico Modugno.

[1] Described as "minimalist, graceful and lyrical",[1] the song is a nostalgic ballad, with Di Bari singing to a woman about her childhood, which she gave up by taking a lover at a very young age; and while this action, being a passage into adulthood, made her appear "cool" before her more innocent peers and transformed her into a self-assured young woman, she did in fact forsake what was – or could have been – "the best time" of her life.

[1] The lyrics of the song underwent several censorship changes, including the raising of the girl's age by three years, and the suppression of a verse referring to previous romantic experiences.

It was succeeded as Italian representative at the 1973 contest by Massimo Ranieri with "Chi sarà con te".