Eurasian watermilfoil (Myriophyllum spicatum) is an exotic invasive vascular plant that has been colonizing North American lakes and rivers for several decades. The present study reconstructed its spread in Québec (Canada) using herbarium specimens, database records, reports, and articles in newspapers and scientific journals. The distribution of this plant has greatly expanded since its introduction in the late 1950s. The species first spread along the St. Lawrence River, and then from the 1970s, it started to establish further inland. In 2017, 14 of the 17 administrative regions in the province had at least one record of Eurasian watermilfoil, with reports from 132 lakes, 16 rivers (including the St. Lawrence River and its fluvial lakes) and brooks, and 4 other waterbodies, such as ponds or artificial waterways. The St. Lawrence River alone accounted for 24 % of the 322 records. The highest number of observations were from the Montérégie, Laurentides, Estrie and Outaouais regions. Although the invasion by this species appears to have progressed significantly in recent years, the increased number of records may, in part, reflect the growing concern of regional stakeholders, rather than an actual spread of the plant.