A woman from Croydon was among 38 new citizens welcomed at City Hall by the Mayor of London.
The fifth London Citzenship Ceremony was hosted by Boris Johnson and chairman of the London Assembly, Darren Johnson on Monday.
Kalyani Johnson Lionarajah was watched by family and friends as she received a certificate and gift of commemoration of her British Citzenship.
Welcoming the new residents, Mr Johnson said "This annual ceremony is about encouraging citizens to get fully involved in their local communities and contribute to the future of their new city."
Darren Johnson added: "I am delighted to welcome London’s newest citizens to City Hall, and proud that they have chosen to make my country their own."