Norton will present live from Rotterdam while Rylan Clark-Neal, Chelcee Grimes and Scott Mills will provide commentary from London
Meanwhile, actor and singer Amanda Holden will serve as the Eurovision spokesperson, also from London, and deliver the results of the UK professional jury vote.
Representing the UK this year is singer-songwriter James Newman, who will perform his single “Embers”.
Norton said: “I’m so excited for Eurovision to return, after the past year we’ve had it’s exactly the kind of joy the world needs.
“The UK have a great entry with James Newman and ‘Embers’, it’s a banger and represents everything that Eurovision is. It’s arguably the best night of the year and I can’t wait – bring it on!”
The Eurovision semi-finals, which are produced by BBC Studios, will air on 18 and 20 May on BBC Four.
The grand final will take place on Saturday 22 May.
Read The Independent’s review of “Embers” here.