Greater Manchester Fire and Rescue Service was called to the restaurant just before 5pm after a fire broke out on the roof garden.
There were no injuries reported in the blaze, which is understood to have started from a patio heater.
The restaurant, which opened in November at the timber-framed Pavilion development, said the fire was limited to part of the roof and it is already working to repair the damage.
The Ivy Spinningfields said in a statement yesterday: “The fire was contained in one section of The Roof Garden thanks to the excellent work of the Greater Manchester Fire Services who have informed us that the building is now totally safe to occupy.
“The ground floor Ivy Brasserie and Ivy Asia on the second floor are completely unaffected by the fire and will continue to operate as usual. All reservations will be honoured.”
The 535-cover restaurant is the biggest site yet for the growing Ivy Collection, and was one of the largest launches in the UK last year.
It spans four storeys and includes a new Asian bar and restaurant concept on the second floor, Ivy Asia.