Contract caterer Pabulum has won a £630,000 deal to provide catering services to Kingdown School in Warminster.
The firm beat eight rivals to win the three- to five-year contract.
"Everyone loved our freshly prepared, seasonally inspired dishes," said Pabulum's director of sales, Paul Donlan. "But it was the combination of a great food offering together with our partnership approach to the business side of the operation that really clinched it."
Finance manager at Kingdown, Sandra George, said: "We were very impressed by Pabulum's presentation. The quality of their food offering is second to none and our whole team really liked their collaborative, hands-on approach to managing the operation aspects of the relationship."