From a daily average of 28, the number shot up to 56 by the middle of this week, Greater Manchester Police said.
Chief Constable Ian Hopkins said that while the forcecould not make a "direct link" to the bombing on Monday in which 22 people died, itis "monitoring" the situation.
"Sadly we've seen an increase in hate incidents since the bomb from 28 on Monday, which is our normal average a day, through to 56 on Wednesday," he said.
Hopkins said the city had largely pulled together in the aftermath and urged the community to come together.
More From This Section
"We've seen compassion but it is important that we continue to stand together here in Greater Manchester, particularly standing together against some of the hate-filled views that we have seen from a very small minority of the community that have no place here," he said.
"I have sent a personal message out to all the faith leaders and places of worship and have thanked them for the support they have shown and stressed that hate crime will not be tolerated," Hopkins said.
His being a Mancunian, as people from Manchester are known, has sent shockwaves in the city.
Of the 119 injured in Monday's attack, 66 remain in hospital and 23 of them are said to be in critical care.