'Nathan', which sees Banks team up with rapper Styles-P, was posted on her Tumblr account.
Banks had previously tweeted that "Styles P is literally my FAVOURITE rapper (sic)".
Listen to 'Nathan' below:
It is currently unclear whether the song will feature on her upcoming free mixtape Fantasea on July 11, or her full-length studio album Broke With Expensive Taste, out in September.
Banks recently confirmed that she has covered The Prodigy for the Fantasea mixtape.
Watch the music video for Azealia Banks's 'Liquorice' below: