This study aimed to characterize the availability of calorie labelling on major online food delivery (OFD) platforms for the largest restaurant brands in Canada to examine differences in provinces with and thosewithout mandatory calorie labelling regulations. Data were collected for the 13 largest restaurant brands with locations in Ontario (with mandatory menu labelling) and Alberta and Quebec (with no mandatory menu labelling) from the web applications of the three largest OFD platforms in Canada. Data were sampled from three selected restaurant locations within each province (n = 117 locations across all provinces) on each platform. Univariate logistic regression models were used to test differences in the presence and amount of calorie labelling and other nutritional information across provinces and platforms. The analytical sample included 48,857 food and beverage items (n = 16,011 in Alberta, n = 16,683 in Ontario, and n = 16,163 in Quebec). Items were more likely to have menu labelling in Ontario (68.7%) than in Alberta (44.4%, OR = 2.75, 95% CI 2.63-2.88) or Quebec (39.1%, OR = 3.42, 95% CI 3.27-3.58). In Ontario, 53.8% of restaurant brands had calorie labelling for > 90% of items, compared to 23.0% in Quebec and 15.4% in Alberta. The presence of calorie labelling also differed across platforms. Nutrition information from OFD services differed across provinces with and thosewithout mandatory calorie labelling. Chain restaurants on OFD service platforms were more likely to provide calorie information in Ontario, where calorie labelling is mandatory, compared to elsewhere where no such policy exists. In all provinces, calorie labelling was inconsistently implemented across OFD service platforms.