The Owls' win was even more impressive as they were still a second division team when they beat Sir Alex Ferguson’s top flight giants by a single goal to nil thanks to John Sheridan’s first-half effort on April 21, 1991.
Here's a look back at the celebrations which followed one of the proudest days in the club’s history as thousands of Wednesdayites gathered outside Sheffield Town Hall.
The 1991 League Cup success is still the Owls’ most-recent piece of silverware.
2. We're all Wednesday
Owls fans on Wembley way with their faces painted
Photo: Sheffield Newspapers
3. DINK!
John Sheridan scores the winner for Sheffield Wednesday against Man United
Photo: Steve Ellis
4. The final score
The scoreboard at Wembley makes great viewing for Owls fans
Photo: Sheffield Newspapers