Scott Dunn, which is headquartered at Chichester, has acquired Imagine Africa although the exact terms of the transaction have not been disclosed.
Founded in 2004, Imagine Africa offers luxury holidays to a range of African destinations and recently branched out into Latin American and Asian tours.
Scott Dunn will provide support on marketing, finance and commercial dealings, but both companies will continue to operate under their respective brands.
Andrew Dunn, chairman of Scott Dunn, said: "We will be able to share our significant expertise in the luxury travel sector with the talented Imagine team, enabling them to potentially expand into areas that they don't yet serve, as well as offer even better service to their guests."
The Crawley-based South East transaction services team at accountancy firm Baker Tilly completed due diligence on Imagine Africa for Scott Dunn.