New to the list are Moving Venue, Urban Caprice, Dish, By Word of Mouth and Richmond Catering.
Caterers that no longer have a place on this list include Rocket, Payne and Gunter, Alison Price and Fizz.
RHH, a division of The Royal Horticultural Society, has hosted events since the venue opened in 1904, including exhibitions, music videos, car launches and films.
The new contracts were awarded after an annual review process at the venue.
Gail Heron, sales and marketing manager at Moving Venue, will be managing the contract for the caterer. "We are delighted to be able to work at RHH; not only is it a stunning venue, but this is an events destination which can cater to larger scale functions, which we are seeing increasing demand for as the market starts to ease back into action," she said.
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