Food insecurity – inadequate or uncertain access to food because of financial constraints – is a serious public health problem in Canada, and all indications are that the problem is getting worse. Drawing on data for 103,500 households from Statistics Canada’s Canadian Community Health Survey conducted in 2017 and 2018, we found that 12.7% of households experienced some level of food insecurity in the previous 12 months. There were 4.4 million people, including more than 1.2 million children under the age of 18, living in food-insecure households in 2017-18. This is higher than any prior national estimate.