Huddersfield Town suffered a disappointing first defeat in four Championship matches after failing to take any of a string of chances.
Ipswich edged it through Ben Pringle's deflected first-half shot and Town ended the game a man down after Jonathan Hogg was forced off injured with all three substitutes already used.
Huddersfield Town XI: Steer, Smith, Hudson, Lynch, Davidson, Hogg, Whitehead, Bunn, Matmour, Dempsey, Wells.
Ipswich Town XI: Bialkowski, Chambers, Berra, Smith, Knudsen, Pringle, Foley, Douglas, Sears, Pitman, Murphy.
There were four changes to the Huddersfield Town side as David Wagner kept to his rotation policy after the midweek draw at MK Dons.
Jason Davidson replaced James Husband at left-back while Joel Lynch returned to the centre of defence instead of Martin Cranie.
As expected Dean Whitehead took over from the suspended Philip Billing in the middle while Kyle Dempsey was chosen in place of the injured Joe Lolley.
Town began strongly, and Dempsey headed wide from Davidson's cross before Nahki Wells' lobbed effort drifted just too high.
Both Wells and Harry Bunn could have done better with decent chances, the first blocked by keeper Bartosz Bialkowski, the second turned over the bar.
Ipswich took a 19th-minute lead with their first real attack as Ben Pringle's shot from Daryl Murphy's cross took a deflection to beat Jed Steer.
Wells had three efforts on goal within three minutes of the opener, but Bialkowski was equal to each, making a particularly good save from the second.
Then when the Bermudian striker broke through in the 37th minute, Christophe Berra's timely tackle halted his progress.
Dempsey had a shot deflected for a corner as Town continued to press, although on a rare Ipswich attack, Murphy turned a Jonas Knudsen cross wide.
Town made a double change just before the hour, with Jamie Paterson replacing Karim Matmour and Cranie coming on for Lynch, who appeared to have taken a knock.
Soon after Tommy Smith's volley fell into the path of Davidson, but the left-back could only knock the ball wide.
Wells had a shot blocked by Berra before Ipswich frontman Murphy put an angled effort inches wide.
Town brought on Elvis Manu for Dempsey in their third change in the 68th minute, just before Paterson's shot was saved by Bialkowski.
Town were left with only 10 players as Hogg went off injured shortly after having a well-struck drive parried by the Ipswich keeper.
Then Bialkowski showed great reactions to punch clear as a Wells shot took a deflection off Luke Chambers.
Town keeper Steer went upfield for a couple of late set-pieces, but there was to be no way through for his side.
Ipswich's Tyke team chief Mick McCarthy enjoyed his return to Yorkshire as his side earned a first win in four.
David Wagner tasted defeat for the first time in four as his side failed to score for only the second time since his arrival in November.
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