Forest returned to winning ways in the Championship with a 3-1 victory over Reading at the City Ground on Saturday afternoon.
Matej Vydra put the Royals in the lead in the 14th minute when Oliver Norwood's shot deflected into his path.
O’Grady, who joined Forest on a season-long loan deal from Championship rivals Brighton & Hove Albion in the summer transfer window, restored parity for the Reds with a close-range shot just six minutes later.
Nelson Oliveira's superb 20-yard curling effort just past the half-hour mark saw Dougie Freedman’s home team go 2-1 up.
Oliveira tapped in O'Grady's cross four minutes after the break to secure all three points for Forest, who ended the game with 10 men due to the dismissal of Jack Hobbs.
“We went behind and you think ‘here we go again’ but it shows the character of the players,” O’Grady told Forest’s official website. “I was happy to be the person who got us back into it and we kicked on from there.”
Over the course of the 90 minutes at the City Ground, hosts Forest had 44% of the possession, took 12 shots of which five were on target, and earned four corners.
Freedman's side are 16th in the Championship table at the moment with 20 points from 18 matches, just five points above the relegation zone.