Hurricane Allen was a rare and extremely powerful Cape Verde hurricane that affected the Caribbean, eastern and northern Mexico, and southern Texas in August 1980. The first named storm and second tropical cyclone of the 1980 Atlantic hurricane season, it was the fifth most intense Atlantic hurricane on record in terms of barometric pressure, behind Hurricane Rita, the 1935 Labor Day hurricane, Hurricane Gilbert and Hurricane Wilma. It was one of the few hurricanes to reach Category 5 status on the Saffir–Simpson Hurricane Scale on three occasions, and spent more time as a Category 5 than all but two other Atlantic hurricanes. Allen is the only hurricane in the recorded history of the Atlantic basin to achieve sustained winds of 190 mph, thus making it the strongest Atlantic hurricane by wind speed. Until Hurricane Patricia in 2015, these were also the highest sustained winds in the Western Hemisphere. Hurricane Allen was also the second strongest tropical cyclone to hit the Gulf of Mexico, with the strongest being Hurricane Rita.

The 1980 Atlantic hurricane season featured nine hurricanes, the most since 1969. This hurricane season was fairly active, with sixteen tropical cyclones forming, eleven of which strengthened into named tropical storms. The season officially began on June 1, 1980, and lasted until November 30, 1980. It was the first time since the 1971 season that there were no active tropical cyclones in the Atlantic basin during the month of June. The season occurred during an ENSO-neutral phase, having neither an El Niño nor a La Niña.