Nathan Tyson snatched a late winner as Derby came from behind to leave Ipswich bottom of the Championship and the future of manager Paul Jewell in doubt.
Ipswich took a deserved lead when DJ Campbell turned in from close range midway through the first half.
Derby levelled just before the break when Theo Robinson capitalised on an error from goalkeeper Stephen Henderson before substitute Tyson struck.
Ipswich have not won any of their last 11 games and have yet to win at home.
Peterborough's home win over high-flying Huddersfield means Ipswich slip to the bottom of the Championship.
The home side had made a strong start with Rams goalkeeper Adam Legzdins forced into three saves inside the opening 10 minutes as he denied Lee Martin, Aaron Cresswell and Jay Emmanuel-Thomas.
It came as no surprise when Ipswich took the lead in the 24th minute when Martin's ball into the box was turned in by Campbell for his second goal in three appearances.
Emmanuel-Thomas almost made it 2-0 on the half-hour but Legzdins produced a stunning save to tip his six-yard strike around a post.
But Derby struck back five minutes before the break. Henderson spilled a shot from Connor Sammon and Robinson was on hand to tuck home the rebound, his third goal in four games.
Having been on the end of some sustained Derby pressure during the second half, Ipswich went close through Martin in the 62nd minute before Emmanuel-Thomas had an effort from 30 yards.
However, Derby had the final word when Tyson scored from close range to pile further pressure on manager Jewell.
Ipswich assistant boss Chris Hutchings said: "Paul is manager of the football club at this moment in time. He's in the office watching the DVD. He wears his heart on his sleeve and he's very disappointed because we've conceded another goal late on, as we have on four or five occasions now.
"When that happens it hurts. Now we've got to come out fighting for another game on Saturday. We're bottom of the league but we're going about our jobs, unless we're told otherwise."
Derby manager Nigel Clough said: "It was deserved, on the balance of play, and some of the stuff we played in the second half was exceptionally good. You're always worried when you have so much of the game and it's still 1-1. It only takes one little mistake or set-play and you end up losing 2-1.
"But I think we deserved it and we're five games unbeaten now, which makes me delighted. Conor Sammon couldn't have done anything more, other than score a goal. He was absolutely superb. He won his headers, held the ball up, made two goals and terrorised the centre-halves. He was outstanding."
Live Text Commentary
Full Time The match has reached full-time.90:00 +3:08
Ben Davies challenges Lee Martin unfairly and gives away a free kick. Stephen Henderson restarts play with the free kick.90:00 +2:06
Outswinging corner taken from the right by-line by Jay Emmanuel-Thomas.90:00 +0:02
Assist by Conor Sammon.90:00 +0:02 Goal scored
Goal! - Nathan Tyson - Ipswich 1 - 2 Derby Nathan Tyson finds the net with a goal from close range to the bottom left corner of the goal. Ipswich 1-2 Derby.90:00 +0:01
Conor Sammon sends in a cross,87:43
Carlos Edwards produces a cross.87:29
The ball is swung over by Carlos Edwards, clearance made by Richard Keogh.86:30
Jason Scotland gives away a free kick for an unfair challenge on Jake Buxton. Adam Legzdins takes the free kick.83:45
Ben Davies takes a shot. Shot from just outside the box by Paul Coutts misses to the left of the target.80:54 Substitution
Substitution Theo Robinson leaves the field to be replaced by Nathan Tyson.80:37
Michael Chopra is flagged offside by the assistant referee. Indirect free kick taken by Adam Legzdins.79:31
Free kick awarded for an unfair challenge on Richie Wellens by Theo Robinson. Stephen Henderson takes the direct free kick.78:15
Richard Keogh takes the free kick.78:15 Booking
Booking The referee books Michael Chopra for unsporting behaviour.78:04
Foul by Michael Chopra on Richard Keogh, free kick awarded.77:31
Aaron Cresswell crosses the ball, save by Adam Legzdins.76:57
Jay Emmanuel-Thomas takes the inswinging corner, clearance by James O'Connor.76:12
James O'Connor challenges Jay Emmanuel-Thomas unfairly and gives away a free kick. Aaron Cresswell restarts play with the free kick.74:28 Substitution
Substitution (Derby) makes a substitution, with Ben Davies coming on for Michael Jacobs.
Shot from inside the area by Paul Coutts clears the bar.73:34
Lee Martin is flagged offside by the assistant referee. Adam Legzdins takes the free kick.73:17
Corner taken left-footed by Jay Emmanuel-Thomas from the right by-line, clearance by James O'Connor.72:20
Free kick awarded for an unfair challenge on Jason Scotland by Will Hughes. Aaron Cresswell restarts play with the free kick. Jay Emmanuel-Thomas takes a shot. Save by Adam Legzdins.69:28
Paul Coutts takes a outswinging corner from the right by-line played to the near post.69:19
Centre by Paul Coutts, clearance by Richie Wellens.68:49
The ball is delivered by Michael Jacobs, Luke Chambers makes a clearance.67:03
Jay Emmanuel-Thomas takes the inswinging corner, save made by Adam Legzdins.66:31
Unfair challenge on Jay Emmanuel-Thomas by Michael Jacobs results in a free kick. Jay Emmanuel-Thomas restarts play with the free kick.65:29
Outswinging corner taken right-footed by Paul Coutts from the right by-line.64:15
John Brayford produces a cross.62:32 Substitution
Substitution Jason Scotland comes on in place of Andy Drury.62:32 Substitution
Substitution Michael Chopra is brought on as a substitute for DJ Campbell.62:13
Lee Martin produces a right-footed shot from the edge of the box and misses to the right of the goal.61:08
John Brayford produces a cross, Luke Chambers makes a clearance.58:27
Michael Jacobs has an effort at goal from outside the penalty box missing to the wide right of the target.57:36
Free kick awarded for an unfair challenge on Will Hughes by Nigel Reo-Coker. Craig Bryson restarts play with the free kick.56:26
Michael Jacobs takes a shot. Stephen Henderson makes a save.56:08
Conor Sammon takes a shot. Blocked by Luke Chambers.55:56
The ball is swung over by Aaron Cresswell, clearance by Will Hughes.54:51
Effort from outside the penalty box by Conor Sammon goes wide left of the goal.54:23
The ball is crossed by Carlos Edwards, Richard Keogh makes a clearance.53:22
A cross is delivered by John Brayford, clearance by Nigel Reo-Coker.51:43
Inswinging corner taken by Andy Drury from the left by-line played to the near post, Theo Robinson manages to make a clearance.51:26
Aaron Cresswell takes a shot. Save made by Adam Legzdins.51:02
Free kick taken by Andy Drury.51:02 Booking
Booking James O'Connor booked.50:57
Free kick awarded for a foul by James O'Connor on Nigel Reo-Coker.50:14
The referee blows for offside against DJ Campbell. Craig Bryson takes the indirect free kick.49:16
Lee Martin concedes a free kick for a foul on Paul Coutts. The free kick is swung in right-footed by Paul Coutts, Danny Higginbotham fouled by Jake Buxton, the ref awards a free kick. Direct free kick taken by Stephen Henderson.48:34
Shot by Richie Wellens from just outside the area goes over the net.47:53
Paul Coutts sends in a cross, save by Stephen Henderson.46:51
Shot from outside the box by Michael Jacobs goes wide right of the target.45:01
The referee gets the second half started.45:00 +0:57 Half time
Half Time The players leave the pitch at half time.45:00 +0:10
The ball is delivered by Paul Coutts, Aaron Cresswell makes a clearance.44:06
The ball is sent over by Paul Coutts, Carlos Edwards manages to make a clearance.43:03
Inswinging corner taken by Michael Jacobs from the left by-line, Stephen Henderson makes a save.41:58
Craig Bryson produces a right-footed shot from deep inside the penalty box which goes wide of the left-hand upright.39:42
Assist on the goal came from Conor Sammon.39:42 Goal scored
Goal! - Theo Robinson - Ipswich 1 - 1 Derby Theo Robinson finds the net with a goal from inside the six-yard box to the top right corner of the goal. Ipswich 1-1 Derby.39:17
Conor Sammon takes a shot. Save by Stephen Henderson.38:53
Carlos Edwards delivers the ball, clearance made by Paul Coutts.37:58
Jake Buxton challenges Andy Drury unfairly and gives away a free kick. Aaron Cresswell takes the direct free kick.35:41
Outswinging corner taken from the right by-line by Paul Coutts, Jake Buxton produces a header from inside the six-yard box that clears the bar.34:47
Michael Jacobs takes the direct free kick.34:47 Booking
Booking Lee Martin is given a yellow card.34:39
Unfair challenge on Paul Coutts by Lee Martin results in a free kick.34:20
Paul Coutts decides to take a short corner.33:20
Lee Martin takes a shot and missed to the left of the target.33:05
Jay Emmanuel-Thomas takes a shot. Richard Keogh gets a block in.32:15
Michael Jacobs crosses the ball, clearance made by Aaron Cresswell.29:55
Inswinging corner taken left-footed by Jay Emmanuel-Thomas from the right by-line.29:44
Jay Emmanuel-Thomas takes a shot. Adam Legzdins makes a save.27:57
Free kick awarded for a foul by James O'Connor on Andy Drury. Free kick crossed by Aaron Cresswell, Michael Jacobs makes a clearance.26:41
The offside flag is raised against Craig Bryson. Free kick taken by Stephen Henderson.26:24
Richie Wellens gives away a free kick for an unfair challenge on Paul Coutts. Craig Bryson restarts play with the free kick.25:12
Jay Emmanuel-Thomas takes a shot. Blocked by Craig Bryson.23:37
Assist on the goal came from Lee Martin.23:37 Goal scored
Goal! - DJ Campbell - Ipswich 1 - 0 Derby DJ Campbell fires in a goal from inside the six-yard box to the bottom left corner of the goal. Ipswich 1-0 Derby.22:08
Jake Buxton concedes a free kick for a foul on Andy Drury. The free kick is delivered left-footed by Aaron Cresswell from right wing, save made by Adam Legzdins.21:32
Michael Jacobs delivers the ball, save by Stephen Henderson.20:09
Handball by Conor Sammon. Direct free kick taken by Richie Wellens.19:21
Michael Jacobs takes a shot. Stephen Henderson makes a save.18:43
Centre by Andy Drury, save by Adam Legzdins.17:16
The ball is delivered by Lee Martin, clearance made by Richard Keogh.15:12
Will Hughes fouled by Luke Chambers, the ref awards a free kick. Michael Jacobs produces a shot on goal direct from the free kick.14:42
Unfair challenge on Craig Bryson by Andy Drury results in a free kick. Direct free kick taken by Will Hughes.12:30
Free kick awarded for an unfair challenge on Danny Higginbotham by Conor Sammon. Richie Wellens takes the direct free kick.10:01
Unfair challenge on Jake Buxton by DJ Campbell results in a free kick. Free kick taken by Adam Legzdins.8:54
Jay Emmanuel-Thomas takes a shot. Save made by Adam Legzdins. Shot from deep inside the area by DJ Campbell clears the bar.7:55
A cross is delivered by Michael Jacobs, save by Stephen Henderson.7:00
Centre by Luke Chambers.4:14
Corner taken short by Jay Emmanuel-Thomas.3:40
Will Hughes challenges Andy Drury unfairly and gives away a free kick. Richie Wellens restarts play with the free kick. Aaron Cresswell takes a shot. Save by Adam Legzdins.2:21
Inswinging corner taken by Michael Jacobs, clearance by Carlos Edwards.1:34
The ball is crossed by Theo Robinson.0:53
Lee Martin takes a shot. Save made by Adam Legzdins.0:00
The match gets underway.
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