There is a growing understanding of the positive economic impacts of national parks in Québec (Canada) on surrounding communities; however, the entire suite of benefits provided by these protected areas, especially those of non-financial value, has yet to be defined. This study reveals the sociocultural and monetary values of approximately 70 ecosystem services and benefits provided by the 23 national parks of southern Québec, including the values linked to indirect use and non-use. Each service or benefit is described qualitatively and quantitatively. In some cases, monetary values were estimated. Based on the value of their ecosystems, the total economic value of the 23 national parks is estimated at CAD 1 billion per year, which represents a natural capital of CAD 31 billion. This total economic value is about three times that of the financial advantages to the surrounding communities. The values obtained in this study are slightly lower than those produced for national parks in Ontario and the United States of America.