"Hallo Hallo" was the Danish entry in the Eurovision Song Contest 1990, performed in Danish by Lonnie Devantier.
The song was performed eleventh on the night, following Israel's Rita with "Shara Barkhovot" and preceding Switzerland's Egon Egemann with "Musik klingt in die Welt hinaus". At the close of voting, it had received 64 points, placing 8th in a field of 22.
The song is sung from the perspective of a woman trying to communicate with her lover by phone. Unfortunately for her, every time she attempts to call him, she only gets his answering machine - and thus feels that she has been made a fool of.
It was succeeded as Danish representative at the 1991 Contest by Anders Frandsen with "Lige der hvor hjertet slår".