Luke Ayling (Bristol City) wins a free kick on the right wing.
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Reid's strike helped Bristol City to their first win on the opening day in the Championship since their 1-0 victory against Blackpool in 2008.
David Perkins (Wigan Athletic) wins a free kick in the defensive half.
Gilbey, who scored five goals in 37 League One games last season, joined the Latics from Colchester United on a three-year deal this summer.
Attempt missed. Gary O'Neil (Bristol City) left footed shot from outside the box misses to the right.
Attempt saved. Aden Flint (Bristol City) header from the centre of the box is saved in the centre of the goal. Assisted by Joe Bryan with a cross.
The 19-year-old England youth international made five first-team starts for the French club since 2015.
Wigan manager Gary Caldwell: "The first half was very positive and we can take a lot from it. If we had continued in the same way I couldn't see us losing.
"But we felt he was worth waiting for. He is a top talent and we now have two centre forwards capable of getting a lot of goals this season.
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"The players we have need some help. We showed for 45 minutes that if we stick to our game plan we can do well, but we have to maintain our form for 90 minutes."
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Joe Bryan (Bristol City) wins a free kick on the left wing.
Attempt missed. Michael Jacobs (Wigan Athletic) left footed shot from the left side of the box is high and wide to the left following a set piece situation.
Goal! Bristol City 2, Wigan Athletic 1. Bobby Reid (Bristol City) right footed shot from the centre of the box to the top left corner. Assisted by Gary O'Neil.
Jonathan Kodjia (Bristol City) hits the left post with a right footed shot from outside the box. Assisted by Gary O'Neil.
Attempt blocked. Michael Jacobs (Wigan Athletic) right footed shot from outside the box is blocked. Assisted by Yanic Wildschut.
"I am looking forward to helping a top young player improve. He is a very grounded lad with great parents and we need to keep his feet on the ground and help him develop."
David Perkins (Wigan Athletic) is shown the yellow card for a bad foul.
Chief operating officer Mark Ashton added: "We still feel we have work to do in this window and everyone at the club is working hard behind the scenes to get business done."
Having scored 74 goals in 98 youth games for Chelsea at different levels, Abraham got on the scoresheet late on with his first goal in senior football.
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Attempt blocked. Joe Bryan (Bristol City) left footed shot from a difficult angle and long range on the right is blocked.
Attempt blocked. Jonathan Kodjia (Bristol City) right footed shot from the left side of the box is blocked. Assisted by Luke Freeman.
Attempt saved. Lee Tomlin (Bristol City) right footed shot from the right side of the box is saved in the bottom left corner.
Donervon Daniels (Wigan Athletic) is shown the yellow card for a bad foul.
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Hördur Bjorgvin Magnusson (Bristol City) wins a free kick in the defensive half.
Goal! Bristol City 1, Wigan Athletic 1. Tammy Abraham (Bristol City) header from the centre of the box to the bottom right corner. Assisted by Gary O'Neil with a cross following a corner.
Lee Tomlin (Bristol City) wins a free kick on the right wing.
Bobby Reid scored a late winner for the hosts when Wigan failed to clear their lines and his deflected shot went in.
Defeat for Wigan in their first game back in the Championship after a one-season absence means they have won just one of their last seven opening day games, their last victory having come against Barnsley in 2013.
Max Power (Wigan Athletic) wins a free kick in the defensive half.
Dan Burn (Wigan Athletic) is shown the yellow card.
Tammy Abraham, who joined Bristol City on loan from Chelsea, levelled from close range with 10 minutes to play.
Lee Tomlin (Bristol City) is shown the yellow card for a bad foul.
Wigan went ahead when new signing Alex Gilbey latched onto Yanic Wildschut's left-wing delivery to fire home.
He has played with Chelsea striker Tammy Abraham, who is currently on loan at City, with England's Under-19 side.
Attempt blocked. Joe Bryan (Bristol City) left footed shot from the left side of the box is blocked. Assisted by Luke Freeman.