Although the UK’s song has not yet been announced, the BBC has said it will be recorded in London, Los Angeles and Nashville and will be produced by Grammy award-winning Martin Terefe.
Over his 45 year career, Humperdinck has sold over 150 million records worldwide, received four Grammy nominations, a Golden Globe for Entertainer of the Year, 63 gold and 24 platinum records.
In the past 12 months he has performed live in the UK, Russia, Netherlands, Belgium, Romania and Israel.
Announcing the UK’s entry, Katie Taylor, BBC Head of Entertainment and Events, said: “Not since the 70s have we had such an established international musical legend represent the nation. We couldn’t be more delighted.
“Engelbert’s experience leaves us in no doubt that he will be able to deliver a standout performance in front of 120 million viewers worldwide.”
“It’s an absolute honour to be representing my country for this year’s Eurovision Song Contest,” said Humperdinck.
“When the BBC approached me, it just felt right for me to be a part of an institution like Eurovision. I’m excited and raring to go and want the nation to get behind me!”
Last year’s UK entry was the reformed boy band Blue who came 11th.
Earlier this week former X-Factor contestants Jedward won a public vote to represent Ireland for a second year.