Across the nineteen countries, median average household availability amounted to 33,9% of total purchased dietary energy for unprocessed or minimally processed foods, 20,3 % for processed culinary ingredients, 19,6 % for processed foods and 26,4% for ultra-processed foods. The average household availability of ultra-processed foods ranged from 10,2 % in Portugal and 13,4 % in Italy to 46,2 % in Germany and 50,4 % in the UK. A significant positive association was found between national household availability of ultra-processed foods and national prevalence of obesity among adults. After adjustment for national income, prevalence of physical inactivity, prevalence of smoking, measured or self- reported prevalence of obesity, and time lag between estimates on household food availability and obesity, each percentage point increase in the household availability of ultra-processed foods resulted in an increase of 0,25 percentage points in obesity prevalence. Conclusions: The study contributes to a growing literature showing that the consumption of ultra-processed foods is associated with an increased risk of diet- related non-communicable diseases. Its findings reinforce the need for public policies and actions that promote consumption of unprocessed or minimally processed foods and make ultra-processed foods less available and affordable.