The City Ground was a hive of activity as Forest shocked the Reds and climbed off the bottom of the table.
After his first attempt came back off a post, Taiwo Awoniyi was able to hit the winner.
It was a long way from their best, and they have yet to win an away league game this season.
Brennan Johnson was denied by Alisson when he tried to score, but Forest could have won by a bigger margin.
There were jubilant scenes on and off the pitch at the final whistle as Forest enjoyed their best day since their return to the top flight.
This was a day to remember for Forest as they thoroughly deserved their victory over a flat Reds.
Steve Cooper hopes this is a season-changing win as Forest slumped to the bottom of the table.
Cooper was given a new contract by Forest this month.
Forest have secured four points from the past two games while other teams have sacked their managers.
The referee blew for the end of the game after Forest had run themselves into the ground.
They have been in a habit of giving leads this season, most notably when they led Bournemouth 2-0 only to lose 3-2, but they were able to hold on for a famous win.
Three of their next five league games are against teams that are currently in the top half of the table, but this memorable win will give them confidence.
Questions will be asked about the performance of the team. Johnson hit a post with Alisson off his line in the closing moments of the game.
After back-to-back victories over Manchester City and West ham, it looked like the Reds were getting back into a rhythm.
It was a million miles away from the win over City.
Trent Alexander-Arnold was close to getting a point near the end, but his performance was not up to par.
The performance on Wednesday will be demanded by the boss.