Emil Nestved Kornvig (; born 28 April 2000) is a Danish professional footballer who plays as a attacking midfielder for Polish Ekstraklasa club Widzew à Âódà º.
Kornvig progressed through the Lyngby Boldklub youth academy, before permanently being promoted to the first team in 2020. He tested positive for COVID-19 without symptoms on 23 September 2020 ahead of Lyngby's match against FC Nordsjælland. On 18 January 2021, he signed a contract extension keeping him at the club until 30 June 2024. He suffered relegation to the Danish 1st Division with the club on 9 May 2021 after a loss to last placed AC Horsens.
On 26 July 2021 he joined Serie A side Spezia.
On the same day where he joined Spezia he went to SønderjyskE on loan.
On 1 September 2022, Kornvig joined Cosenza on loan with an option to buy.
On 1 August 2023, Kornvig signed with Serie B club Cittadella.
After only half a season at Cittadella, Kornvig moved on to Norwegian top-flight club Brann in on 16 February 2024.
On 23 January 2026, Kornvig joined Polish Ekstraklasa club Widzew à Âódà º for a reported fee of â¬2.3 million, signing a three-and-a-half-year deal.