Previous research on foods advertised in supermarket circulars revealed that advertisement for foods at promotional prices influence food choices and shopping behaviour, but no paper reporting the Latin American context was identified. Furthermore, most studies only assessed the products advertised on the front pages and not in the entire circulars. This paper quantifies and categorizes, according to level of processing, the foods advertised in circulars from four Brazilian supermarket chains in order to assess their compatibility with the national dietary guidelines issued by the Ministry of Health. Printed and online circulars were collected between June and July 2016. Foods items advertised were identified and classified into one of four categories using the NOVA classification as unprocessed or minimally processed, processed culinary ingredient, processed or ultra-processed. Sixteen documents were analysed, and 1786 food items identified, where 23% were categorized as unprocessed or minimally processed, and 63% as ultra-processed foods. While the mean proportion of ultra-processed and unprocessed or minimally processed foods advertised on circular covers was similar (p = 0.49), the mean proportion of ultra-processed foods advertised in the entire circular was significantly higher than unprocessed or minimally processed foods (p < 0.001). Brazilian supermarket circulars are stimulating the acquisition of ultra-processed foods, which does not encourage food choices to be in line with what is recommended by the Dietary Guidelines for the Brazilian Population.