The 14-year-old went missing last Sunday.
He was last seen close to Shore Road in north Belfast.
The police confirmed a body had been found at 9.45am this morning and believe it to be the teen.
Police moved to end speculation as to the cause of death.
Superintendent Muir Clark said: “While we have no official identification, we believe it is the missing teenager Noah Donohoe.
“Our thoughts and sympathies are with Noah’s family and we are continuing to provide support to them at this very difficult and heartbreaking time.
“It is disappointing that I, again, need to comment about people circulating a number rumours about Noah’s disappearance which are completely without foundation.
“This type of commentary and rumour is distressing for Noah’s family and unhelpful.”