| | Event Type | Place | Event Start Date | Fatalities | Injured / Infected | Evacuated | Estimated Total Cost |
 | Meteorological - Hydrological:
Geomagnetic Storm | Across Canada | October 31, 1903 | 0 | 0 | Unknown | Unknown |
 | Explosion:
Non-Residential | Cumberland, British Columbia | July 15, 1903 | 15 | 8 | Unknown | Unknown |
 | Meteorological - Hydrological:
Wildfire | Hopewell Cape, New Brunswick | June 5, 1903 | Unknown | Unknown | Unknown | Unknown |
 | Fire:
Residential | Hull, Quebec | June 3, 1903 | Unknown | Unknown | Unknown | Unknown |
 | Fire:
Non-Residential | Saint-Hyacinthe, Quebec | May 20, 1903 | 0 | Unknown | Unknown | Unknown |
 | Transportation accident:
Marine | Thrum Cape, Nova Scotia | May 5, 1903 | 15 | 0 | Unknown | Unknown |
 | Geological:
Landslide | Frank AB | April 29, 1903 | 70 | 23 | 0 | Unknown |
| Geological:
Landslide | Upper Arrow Lake BC | February 28, 1903 | 0 | 0 | 0 | Unknown |
| Explosion:
Non-Residential | Departure Bay, British Columbia | January 14, 1903 | 12 | Unknown | Unknown | Unknown |
| Explosion:
Non-Residential | Grand Forks BC | January 1, 1903 | 16 | 0 | 0 | Unknown |