The objective of the study was to identify how consumers’ level of knowledge and awareness on food waste differed among four countries: Denmark (DK), Greece (GR), Indonesia (IDN) and Taiwan (TWN). The study was conducted online through SurveyXact and, in total, 610 respondents were used for the data analysis. The majority of respondents from all four countries were young (18–35), had medium to high education and we consider at the present study that our respondents belong to the millennial generation. The results of our study showed significant differences in the level of knowledge and awareness on food waste among the four different countries. Respondents from all four countries appeared to be concerned about food waste and related issues, but did not know the level of their own contribution in generating food waste. TWN was the country that showed the highest level of knowledge on consumer-generated food waste.