The teenage girl was found with a bullet wound in Tottenham on Monday night and pronounced dead at the scene.
The boy had been found with gunshot wounds in Walthamstow earlier, with another boy, 15 who had stab injuries.
The shootings come amid concerns over rising violent crime in the capital. Police do not know if the attacks are connected at this stage.
A police cordon is still in place in Chalgrove Road, near Northumberland Park, where the girl was pronounced dead at 22:43 BST.
A local resident, who did not want to be named, said she heard multiple shots, which sounded like a "bomb" exploding.
She said: "It's not nice. I've lived here for 40 years, and in the last two or three years it's become not a nice place.
"There are so many drugs, stabbings and killings."
Formal identification has yet to take place, but the girl's next of kin have been informed of her death.
In the Walthamstow shooting, police said they were called to Markhouse Road shortly after 22:00 following reports of gunfire.
The 16-year-old boy was found with bullet wounds and taken to an east London hospital, where he remains in a critical condition.
The 15-year-old was also found at the scene with stab injuries and was also taken to hospital.
Police had initially given his age as 17.
There have been no arrests in either investigation.
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