Famara Diedhiou heads in his sixth goal of the season
Bristol City extended their unbeaten run to 11 matches with their first win at Ipswich Town in 39 years.
City led when Josh Brownhill's deflected shot wrong-footed Town goalkeeper Bartosz Bialkowski, and Famara Diedhiou headed in Jamie Paterson's cross to double the lead.
Martyn Waghorn reduced the deficit when he slammed in Jonas Knudsen's cross for his sixth league goal of the season.
But Bobby Reid wrapped up the points with a deflected shot off Knudsen.
Goals looked on the cards at Portman Road in a match between the Championship's two most potent attacks who had netted 36 times between them before kick-off.
And they didn't disappoint with City having the better of a breathless first half as Reid thudded a shot against the crossbar, and Aden Flint's header forcing Bialkowski to tip over.
Mick McCarthy's side fought hard to get back on terms after the break, Joe Garner going closest with a fine volley which brought a save out of Frank Fielding.
But City retained their threat on the break and were good value for their first win at Portman Road in 13 attempts - a run stretching back to September 1978.
The Robins have now won four of their past six in the league and move up to fifth, leapfrogging Ipswich who fall two places to eighth after a fourth defeat in their last six.
Bristol City head coach Lee Johnson: "I was delighted it's a really difficult place to come particularly with the form that Ipswich are in there was a lot of talk about obviously the threat of their front four.
"I thought first half we dealt with it quite well and we played some good stuff and we had the lion's share of opportunities, the lion's share of possession and we worked our socks off.
"I think that their goal could have had the potential to kill us a bit, obviously the timing of it and allowing Ipswich to build their confidence and grow in stature in the game and I thought in the second half we showed our steel."
Ipswich manager Mick McCarthy: "It's frustrating but they deserved to win. After three minutes the goal took the wind out of our sails.
"They are a good team and they coped very well. It helps if you are 1-0 up after three minutes and for us to not get a foothold in the game.
"They handled it particularly well and they took their chances.
"I thought that we were a threat in the first half but not in the second half and they looked sharper."
