Javon Riley, 33, from Moselle Street, Tottenham, was convicted at the Old Bailey of the attempted murder of three men and causing grievous bodily harm to the child.
Although Riley did not fire the gun, he played a significant role in planning and executing the attack on May 29, 2024.
The Metropolitan Police said Riley is part of an organised crime network and targeted rival gang members outside a busy restaurant on Kingsland Road.
He was found guilty on August 18 following a three-week trial.
Riley will be sentenced on Friday, September 12.
At 9.19pm on the day of the shooting, a gunman on a stolen Ducati Monster fired six bullets.
One of these hit the young girl in the head, while the others struck three men.
All four victims required emergency, life-saving surgery.
Detectives have established that Riley had scoped out the area in the days leading up to the attack.
Evidence showed he sat at a bar opposite the restaurant, sipping a pina colada as he watched the flow of traffic on Kingsland Road.
On the night of the shooting, Riley drove from north London in a stolen car and repeatedly passed the restaurant to ensure the intended targets were present.
Following the attack, he helped the gunman avoid capture, transporting him from the scene and disposing of the firearm.
Neither the gun nor the gunman have been found.
Detectives are now offering a financial reward of up to £15,000 for information that leads to the identification, arrest, and prosecution of the shooter.
Detective Inspector Ben Dalloway, who led the investigation, said: “Javon Riley’s actions traumatically altered the trajectory of a little girl’s life.
“While this outcome serves as a slither of justice, the dangerous individual responsible for pulling the trigger remains on our streets.
“Those who ordered this shooting are a highly sophisticated criminal organisation.
“Justice must be secured for this little girl and her family.”
The girl’s mother said: “In a single moment, the future we had imagined for our daughter was torn away.
“She was once an energetic, adventurous child – everything that celebrated movement, energy, and life.
“Now, weakness on her left side means she can only watch from the sidelines, living with a titanium plate in her skull and a bullet still in her brain.
“The world we once believed was safe for our child now feels frightening and uncertain.
“This was not just an accident – even if our daughter was not the intended target, those responsible were still attempting to take lives.
“It is brutal and inhumane.
“We live with this pain every day, knowing nothing will ever be the same for our family.”
The Ducati Monster used in the shooting, with a white body, red chassis, and red wheels, was stolen from a Wembley property in 2021.
At the time of the shooting, it displayed the registration plates DP21 OXY.
It has since been recovered and is believed to have links to Nunhead.
Detective Superintendent Brittany Clarke, who leads policing in Hackney and Tower Hamlets, said: “This incident had a devastating impact on local communities throughout north London.
“Although crime has decreased in Hackney, events such as this remind us that violence has a lasting effect on children and young people.
“We continue to work with the council, local charities, and wider partners to address cause and impact of organised crime.”
Anyone with information relating to this incident is urged to contact the Met via 101 or Crimestoppers anonymously on 0800 555 111.
