Sodexo has secured a seven-year contract to provide catering and housekeeping at the new Licensed Victuallers School (LVS) in Begbroke, Oxfordshire.
The contract at the new school, which specialises in educating students with autism, will begin when the school opens in September.
It is owned by the Licensed Trade Charity, which also runs LVS Hassocks in West Sussex where Sodexo has provided services since 1982.
Marlies Hoogeboom, Sodexo's account director in its independent schools division, said: "Independents by Sodexo is delighted to be further strengthening our partnership with the Licensed Trade Charity with this extension to their portfolio, which now includes all three of their schools."
Ian Mullins, director of education at the Licensed Trade Charity Oxford added: "We anticipate approximately 20 pupils in the first year, growing to its maximum capacity over four years of approximately 88 students, both day and boarding.
"The students at our special schools have lower thresholds of tolerance for food and often experience allergies to certain types of diet. As a result, the demands can be quite high for ensuring that a nutritional meal is supplied within certain restraints. Sodexo has that experience, built up over many years in other institutions, but from our point of view their excellent work at Hassocks will be further developed at our new site in Oxford."