Denmark in the Eurovision Song Contest 1990
Denmark was represented at the Eurovision Song Contest 1990 with the song "Hallo Hallo", composed by John Hatting and Torben Lendager, with lyrics by Keld Heick, and performed by Lonnie Devantier. The Danish participating broadcaster, DR, organised the Dansk Melodi Grand Prix 1990 in order to select its entry for the contest.
Before Eurovision
DR held the Dansk Melodi Grand Prix 1990 on 24 March at the Tivoli Concert Hall in Copenhagen, hosted by two former Danish Eurovision representatives, Birthe Kjær and Dario Campeotto. Ten songs took part with the winner being decided by two rounds of televoting. In the first round the bottom five songs were eliminated, then the remaining five were voted on again to give the winner. Other participants included three-time Danish representative Kirsten Siggaard and Jørgen Olsen, the winner.| Draw | Artist | Song | Songwriter | Result |
| 1 | Kirsten Siggaard | "Inden længe" | Jon Lundager, Mette Nybo | Eliminated |
| 2 | Vocal Crew | "Hva' er det du vil" | Jesper Malmose, Morten Wedendahl | Eliminated |
| 3 | Lecia Jønsson | "Krig og fred" | Lecia Sundstrøm Jønsson | Eliminated |
| 4 | Lonnie Devantier | "Hallo Hallo" | John Hatting, Torben Lendager, Keld Heick | Advanced |
| 5 | Jørgen Olsen | "Berlin" | Wolfgang Käfer, Jørgen Olsen | Advanced |
| 6 | Helle Guldbech | "Det var en drøm" | Jan Glæsel, Klaus Kjellerup | Eliminated |
| 7 | Käte and Per | "Kender du typen" | Per Damgaard, Hilda Heick, Keld Heick | Advanced |
| 8 | Aviaja Lumholt | "Fordi jeg elsker dig" | Kim Helweg, Morten Nilsson | Eliminated |
| 9 | Birgitte Gade | "Ræk mig din hånd" | George Keller, Jens P. Meiner | Advanced |
| 10 | The Boys | "Du er min musik" | Jens Peter Clausen, Kim Jacobsen, Klaus Phanareth | Advanced |
At Eurovision
On the night of the final Devantier performed 11th in the running order, following and preceding. The song was very much in the same uptempo pop vein which had characterised Danish Eurovision entries throughout the 1980s. At the close of voting "Hallo Hallo" had received 64 points from 13 countries, placing Denmark 8th of the 22 entries, the country's fifth consecutive top 10 finish. The Danish jury awarded its 12 points to Switzerland.Voting
| Score | Country |
| 12 points | |
| 10 points | |
| 8 points | |
| 7 points | |
| 6 points | |
| 5 points | |
| 4 points | |
| 3 points | |
| 2 points | |
| 1 point |
| Score | Country |
| 12 points | |
| 10 points | |
| 8 points | |
| 7 points | |
| 6 points | |
| 5 points | |
| 4 points | |
| 3 points | |
| 2 points | |
| 1 point |