The 18-year-old, who joined the Championship outfit on loan in February, opened the scoring against Millwall with a low shot from outside the box that found its way into the bottom corner.
The hosts hit back but Birmingham ultimately ended up 3-2 winners, putting them eight points clear of the relegation zone.
This was Ibe's fifth appearance for Lee Clark's men and a timely first goal for the side.
Meanwhile, former Liverpool midfielder Yossi Benayoun also scored for QPR against Wigan at Loftus Road, with the Israeli's goal proving the winner for Harry Redknapp's men.
The 16th-minute opener was Benayoun's second goal in as many games, although the midfielder almost undid his hard work by later being sent off for the home side.
The 33-year-old played for the Reds between 2007 and 2010, before going on to enjoy spells at Chelsea and Arsenal.
QPR now move back up to third in the Championship, three points above Derby after Steve McClaren's men lost 2-1 to Ipswich.
It is apt, then, that a former star of Liverpool's past scored on a night when a potential star of the future also netted to open his tally for the season.
Now fans both from Anfield and St Andrew's will be hoping for more of the same from Ibe.