Kent's Gusbourne Estate came out top with three gold medal awards, including two "Gold Outstandings", making it the only English vineyard to take the competition's highest accolade.
English Wine Producers marketing director Julia Trustram Eve said: "It's great to see that English wines are continuing to prove their international status through these fantastic competition successes. It's the consistency that is really showing just what world-class wines are produced in England."
The IWSC's northern hemisphere results, which exclude France and Italy, also brought success for other emerging wine-producing nations, with the Czech Republic, Romania, Greece and Georgia also increasing their medal hauls.
Meanwhile, English sparkling wine producers are expected to benefit from a poor grape harvest in Italy, with lower volumes and higher prices of Prosecco this summer likely to tempt more price-conscious shoppers to try the English equivalent.
Chapel Down Winery chief executive Frazer Thompson said: "For us, that is a good thing. The gap between the price of English sparkling wine and Prosecco will narrow and once people try English wine they understand why it is more expensive."
Plumpton College has launched the UK's first wine business honours degree, covering the wine trade, wines of the world and business management.
Students will be able to participate in commercial grape-growing and wine-making on the East Sussex college's 10ha vineyard.