David Dixon had not been seen or heard from after an explosion on a train at Maalbeek metro station and two blasts at Zaventem Airport in the city on Tuesday.
The 53-year-old's family said they had received 'the most terrible and devastating news about our beloved David'.
"At this most painful time our family would gratefully appreciate it if we could be left alone to grieve in private," they added in a statement.
A spokesman for the Foreign and Commonwealth Office said the Government's thoughts were with the family, who are being supported by embassy staff.
Mr Dixon lived in Brussels for the past ten years with his partner Charlotte Sutcliffe - who is originally from Creswell - and their seven-year-old son.
The family, who have a house in the Mapperley area of Nottingham, were due to visit over Easter.
National newspaper reports suggest Mr Dixon texted relatives confirming he was 'fine and safe' before boarding the train where a suicide bomber blew himself up.
Mr Dixon, originally from Hartlepool, was described by friends as 'a lovely guy' and 'an amazing man'.
The bombs killed at least 34 people and left about 200 more seriously injured.
The group calling itself Islamic State has claimed responsibility for the attacks.