Independent wine supplier United Wineries has appointed North South Wines as the sole UK and Ireland agents for both its Berberana and Monistrol still and sparkling Spanish wine brands.
It follows the success experienced by North South Wines in distributing the brands into the UK impulse and cash-and-carry channels through 2015.
The agreement will take effect from April 1.
Elena Reviriego, newly appointed chief executive of United Wineries, said: "The UK remains an important market for United Wineries, as consumer's demand for every day, affordable, good quality Spanish wines is continuing to grow.
"We are delighted to have signed this agreement with North South Wines for our well-known wine brands and we are excited about the future.
"We are confident that the North South Wines team can build on the success they have already seen with our brands and replicate this across all channels in the UK and Ireland."
Kim Wilson, commercial director at North South Wines, added: "In just two years of trading, we have managed to achieve an excellent track record of building brands with consumer appeal and a focus on quality in the sectors we specialise in.
"We are thrilled to bring Berberana and Monistrol into the portfolio and represent the brands in the UK and Ireland.
"We have enjoyed working with the team at United Wineries over the last 18 months and have delivered success in the Impulse channel, which we look forward to repeating online and in the multiples with the brands now fully under our umbrella."
United Wineries was founded in Switzerland in 1993.
Its primary focus is premium wines from Spain, although it also distributes a number of wines from Argentina.
North South Wines was launched in 2014 as a specialist, direct-supply wine distributor with multi-channel expertise.
Founded by Kim Wilson and Joy Edmondson from Ehrmanns in partnership with ex-Nyetimber finance chief Hamish Gillespie, it is part-owned by three wineries: Italy's The Wine People, De Bortoli from Australia and New Zealand's Waimea Family Estates.
In addition to those of its co-owners, the company currently distributes wines from a further 17 estates from around the world, with an particular emphasis on Italy and Spain.
It recently added leading South African wine producer KWV to its portfolio of New World partners.