The 2031 Belleville, Ontario tornado was a violent and long-tracked tornado, rated EF5, which struck southern Ontario, primarily the city of Belleville, in the evening of Wednesday, June 25, 2031. Touching down to the northeast of Colborne at 6:33 PM EDT, the tornado gradually strengthened before cutting through far northern Belleville at EF5 strength, causing catastrophic damage, several fatalities, and numerous injuries. The tornado then continued through Lennox & Addington County before dissipating in western Frontenac County.
The tornado's path was 64.40 miles long and 900 yards wide at its peak. The tornado's greatest damage occurred within the Belleville city limits, where wind speeds were estimated at 240 miles per hour. The tornado caused a total of 12 fatalities and 89 injuries along its path, making it the fourth-deadliest tornado in Canadian history, tied with the F3 Pine Lake, Alberta tornado on July 14, 2000. The Belleville tornado was also the second-costliest on record in Canada, behind the Edmonton, Alberta tornado on July 31, 1987.
Notably, the Belleville tornado was the first tornado to be rated EF5 on the Enhanced Fujita scale in Canada, as well as the first to be rated F5 or EF5 in the province of Ontario. Additionally, the tornado was the longest-tracked in Canada since the Orangeville, Ontario tornado on May 31, 1985, and one of the longest-tracked in the country's history.