Denmark replaced Wales at the top of Group I after edging their Euro 2025 Under-21 Championship qualifier at Rodney Parade in Newport.
The visitors led early when Tobias Bech fired low past Ed Beach, before Luke Harris, Charlie Savage and Joe Taylor went close for Wales.
Oliver Nielsen headed in a late corner to double the lead after the break.
Cian Ashford poked home a last-gasp consolation after Filip Jorgensen parried Rubin Colwill’s free-kick.
Denmark now lead the group on goal difference but have played a game less than Wales, with both on eight points.
Iceland, who Wales beat 1-0 last Thursday in Newport, are third on six points but have two games in hand on Matthew Jones’ side.
- 3BeckBooked at 34mins
- 14CotterillSubstituted forColwillat 45′minutes
- 7KingSubstituted forHammondat 45′minutes
- 15BevanSubstituted forAshfordat 77′minutes
- 11TaylorSubstituted forPopovat 45′minutes
- 16SavageSubstituted forCrewat 85′minutes
- 3Thiesson Kristensen
- 13ProvstgaardBooked at 90mins
- 17SørensenSubstituted forFrauloat 67′minutes
- 7BechSubstituted forBreumat 90+1′minutes
- 9OsulaSubstituted forRasmussenat 78′minutes
- 11KvistgaardenSubstituted forLindat 78′minutes
- José Luis Munuera Montero
Match ends, Wales U21 1, Denmark U21 2.