The Serbian government confirmed that Branislav Milinkovic, 52, had died on Tuesday, but did not give details. It paid tribute to his work.
Emergency services were called to the scene, but were not able to revive him, sources at Brussels airport said.
Prosecutors in Brussels say they are treating Branislav Milinkovic’s death as a suicide.
He is thought to have been at the airport on Tuesday evening to meet Serbia’s deputy foreign minister and other officials who had arrived in Brussels for diplomatic talks.
The incident happened at around 18:00 local time.
After talking with colleagues, Branislav Milinkovic suddenly strolled to a barrier, climbed over and flung himself to the ground below, a diplomat told the Associated Press.
Earlier on Tuesday, Branislav Milinkovic had seemed “completely normal, talking to journalists in the corridors of NATO”, a Serbian journalist in Brussels told the AFP news agency.
NATO Secretary General Anders Fogh Rasmussen said in a statement that he was “deeply saddened” by the news.
“Ambassador Branislav Milinkovic was a highly respected representative of his country and will be missed at NATO headquarters,” Anders Fogh Rasmussen said.
Serbia is not a member of NATO but it does have a mission at the alliance’s headquarters in Brussels because it belongs to the Partnership for Peace programme, which helps countries co-ordinate on defence and security issues.
Branislav Milinkovic had been an ambassador since 2009.
He had previously worked as a journalist and was an active opponent of Serbia’s former leader Slobodan Milosevic. Branislav Milinkovic leaves behind a wife and a six-year-old son.
6it4nWfxqWIThe US House Ethics Committee has voted to release its report on former Republican Representative…
ABC News has agreed to pay $15 million to President-elect Donald Trump to settle a…
South Korea’s parliament has voted to impeach President Yoon Suk Yeol over his failed attempt…
Israeli war planes have carried out more than 100 air strikes in Syria on December…
President-elect Donald Trump has threatened to impose 100% tariffs on the BRICS countries if they…
Syrian troops have withdrawn from the city of Aleppo following an offensive by rebels opposed…