The move will see the caterer continue to work across the gallery’s dining establishments, which include two restaurants – The National Dining Rooms and The National Café – two cafes and a private dining room.
Over the next 12 months, Peyton and Byrne plans to redesign and develop new concepts for gallery restaurant The National Café as well as its self-service areas, and there are plans to work with the National Gallery Company to develop other spaces.
Peyton and Byrne has handled the gallery’s dining offering for the past nine years.
Oliver Peyton, Peyton and Byrne’s founder, said: "The National Gallery is one of the greatest museums in the world and it is critical that the dining experience is world class too.
"Following nine years’ experience, Peyton and Byrne are perfectly placed to continue enhancing the service and food standards at this iconic venue and as such we have big plans to evolve the current restaurant and café concepts."
Douglas Gilmore, trading director, National Gallery Company Ltd, added: "In Peyton and Byrne we have a partner renowned for quality and creativity. They have recently strengthened their senior team and demonstrated an ability to invest in their estate, which has not diminished the diversity or development of their offer.
"We have ambitious plans to enhance the public catering offer at The National Gallery and believe our well established relationship with Peyton and Byrne, who understand our visitor requirements, will be a significant factor in helping us realise these plans."