The first blaze broke out in rented accommodation in William's Park, in Rathmines, when emergency services were called at around 9pm.
Two people on the top floor of the building had to be rescued by members of Dublin Fire Brigade from Donnybrook and Dolphin's Barn stations.
They were treated for the effects of smoke inhalation at the scene and did not require hospital treatment.
And in a second fire at 10.30pm, a woman was rescued from a building on South Circular Road near Camden Street.
Fire crews from Tara Street and Dolphin's Barn fought the fire while the women, who suffered minor burns and smoke inhalation, was taken to St James's Hospital.