The UK retained its position as the third most important European source market for Germany in 2018 with growth in overnight stays of 4%.
Visitors from Ireland rose by 7.6% to 536,733 overnight stays.
Overall inbound tourism to Germany grew by 5%, a rate higher than in the previous 2 years.
The federal states of Bavaria, Berlin, Baden-Wurttemberg, North-Rhine Westphalia and Hesse were the most popular destinations.
UK travellers were the largest visitor group for Berlin when measured in overnight stays.
The nearby state of Brandenburg reported almost a 50% increase from the UK compared to the previous year. Bavaria saw the highest increase for visitors from Ireland.
The German National Tourist Board recently launched its ‘German Summer Cities’ campaign to promote the country as a summer destination.
UK and Ireland director Beatrix Haun said: “The UK and Ireland are both very special source markets for Germany, with many mutual cultural and lifestyle associations.
“The increase seen in 2018’s year end figures demonstrates the on-going appeal of Germany as a year-round destination and we hope our campaigns for 2019 will prove equally popular.
“We’re looking forward to welcoming even more visitors from Ireland and the UK to Germany in future.”