Match ends, Queens Park Rangers 1, Nottingham Forest 2.
Nottingham Forest won away from home for the first time since February, coming from behind to beat 10-man QPR.
Charlie Austin, who remained at Loftus Road despite Premier League interest during the summer, netted his fifth goal of the season from 20 yards.
Henri Lansbury levelled from the spot past Alex Smithies after QPR goalkeeper Robert Green had been sent off for bringing down debutant Chris O'Grady.
Another new Forest signing, substitute Nelson Oliveira, slotted in the winner.
QPR missed out on a fourth straight league win, while the visitors won for the first time in four games.
While Austin was inevitably the main focus, having stayed with Rangers beyond the transfer deadline, it was O'Grady who was able to turn the game in his side's favour.
After a dour first half of few chances, Austin broke the deadlock with a low left-footed shot that beat the diving Dorus de Vries.
But O'Grady, a loan signing from Brighton on deadline day, worked tirelessly throughout as Forest's lone front man and earned the penalty on which the game turned.
Green attempted to control a backpass but allowed the ball to squirm away from him, and committed a foul as O'Grady nipped in.
Replacement goalkeeper Smithies failed to keep out Lansbury's drilled spot-kick and was beaten again shortly afterwards by Oliveira, who side-footed home from 15 yards.
Forest, who were in action for the first time since top scorer Michail Antonio joined West Ham for a reported £7m, held on for their first win on the road since beating Reading 3-0 on 28 February.
QPR head coach Chris Ramsey:
"I thought the backpass was poor and Rob made a decision, thought he could deal with it and unfortunately the guy (O'Grady) did well to keep running at him and cause him to bring him down.
"Then for the winning goal, I thought we could have defended that better. That goal wasn't down to us being down to 10 men, that was poor defensive play.
"It's very disappointing. At the time we had 11 players on the field I thought there was only going to be one winner."
Nottingham Forest boss Dougie Freedman:
"I felt we were the better side and deserved to win the game. We played some fabulous football in the first half and took the sting out of the crowd.
"QPR had a 15-minute spell in the second half but, even when it was 11 versus 11, I felt were we playing well.
"Obviously the sending-off helped, although I felt that but for a trademark goal from Charlie Austin we were the better team."
- 1GreenBooked at 72mins
- 24PerchBooked at 21mins
- 26AngellaSubstituted forHallat 32'minutes
- 28TözsérSubstituted forGladwinat 86'minutes
- 21LuongoSubstituted forSmithiesat 73'minutes
- 1de Vries
- 10LansburyBooked at 88mins
- 4MancienneSubstituted forEbecilioat 52'minutesSubstituted forOliveiraat 69'minutes
- 34WalkerSubstituted forWardat 45'minutes
- 29O'GradyBooked at 90mins
- 15Mendes da Graça
- Keith Hill
- Shots on Target
Second Half ends, Queens Park Rangers 1, Nottingham Forest 2.
Chris O'Grady (Nottingham Forest) is shown the yellow card.
Foul by Chris O'Grady (Nottingham Forest).
Grant Hall (Queens Park Rangers) wins a free kick in the defensive half.
Attempt blocked. Nélson Oliveira (Nottingham Forest) right footed shot from outside the box is blocked. Assisted by Jamie Ward.
Offside, Queens Park Rangers. Charlie Austin tries a through ball, but Ben Gladwin is caught offside.
Matt Mills (Nottingham Forest) wins a free kick in the defensive half.
Foul by Ben Gladwin (Queens Park Rangers).
Attempt missed. Ryan Mendes (Nottingham Forest) right footed shot from outside the box misses to the right. Assisted by Chris O'Grady.
Eric Lichaj (Nottingham Forest) wins a free kick on the right wing.
Foul by Charlie Austin (Queens Park Rangers).
Jamie Ward (Nottingham Forest) wins a free kick in the attacking half.
Foul by James Perch (Queens Park Rangers).
Hand ball by Nélson Oliveira (Nottingham Forest).
Henri Lansbury (Nottingham Forest) is shown the yellow card.
Foul by Matt Mills (Nottingham Forest).
Matthew Phillips (Queens Park Rangers) wins a free kick in the defensive half.
Substitution, Queens Park Rangers. Ben Gladwin replaces Daniel Tözsér.
Corner, Nottingham Forest. Conceded by Alex Smithies.