Irish Distillers said that sales of Jameson Irish Whiskey rose by 3% globally during the six months to the end of December despite the "extremely difficult environment" due to Covid-19.
Jameson recorded volume growth in key markets including the UK, with sales there up by 12%.
The US reported sales growth of 7%, Russian sales rose by 7% and sales in Ireland were up 4%.
Irish Distillers, which is owned by France's Pernod Ricard, sold 4.75 million cases of Jameson in the six month period - its highest ever volumes in the first half of the year.
"This was aided by sales of over 2 million cases in the US in the first half of the year for the second year in row but was also buoyed by growth in other key markets including the UK, Russia, and Ireland. The brand also saw continued growth in emerging markets including Nigeria, India, and Brazil," the company said.
Irish Distillers said that within the broader Jameson family, its Jameson Black Barrel whiskey posted volume growth of 31% globally compared to the same time the previous year.
"Despite an extremely difficult environment, we had a solid start to the financial year, with sales of Jameson Irish whiskey showing resilience by growing 3% in the first half of the year," Conor McQuaid, Chairman and CEO of Irish Distillers said.
Mr McQuaid said that the ready-to-drink (RTD) category has exploded in recent years.
"The trend continued in 2020 with Jameson RTD range up by 42% in value compared to the first half of the previous year due to growth in the Australia, New Zealand, UK and Canada," he stated.
"While our results reflect increased demand in the off-trade outlets, the pandemic continues to present challenging business conditions for our partners in hospitality, the on-trade and global travel retail," Mr McQuaid said.
"We understand that it will take some time for those sectors to recover and reach pre-pandemic growth levels, but we are optimistic for the future and confident that they will rebound and emerge even stronger than before," he added.
Irish Distillers also said that the single pot still Irish whiskey category continued its resurgence, driven by value growth in Redbreast - which rose by 33%.
Value growth was also seen across the Spot range (+31%), the company added.
Meanwhile, Pernod Ricard has today forecast a return to organic sales growth in the full year, after a strong performance in its key US and Chinese markets helped the French spirits group beat estimates for first-half profit and sales.
Pernod is the world's second-biggest spirits group behind Diageo.
Double-digit sales growth in China and a 5% sales rise in the US propped up results for Pernod, as stuck-at-home consumers splurged on its Jameson Irish whiskey and Martell cognac.
Diageo also reported an unexpected rise in first-half underlying net sales growth as its premium tequila and bourbon flew off the shelves at US retail stores.
But Pernod flagged continued uncertainty and volatility as the Covid-19 crisis continued to hit duty-free sales and alcohol consumption in bars and restaurants.
Pernod, whose fiscal year starts on July 1, said profit from current operations in the six months to December 31 reached €1.595 billion, an organic decline of 2.4% that was still better than analysts' expectations for a 7.9% fall.
Sales reached €4.985 billion, representing an organic decline of 3.9%, compared with analysts' expectations for a 5.4% drop.
Last month, smaller French peer Remy Cointreau beat third-quarter sales forecasts and said it was confident that demand for its premium cognac in China and the US would fuel a profit recovery this year.
