The 54-year-old was appointed on Tuesday afternoon in place of Paul Lambert, who was sacked on Sunday night.
Cook joins on a two-and-a-half-year deal and brings former Town winger Gary Roberts with him as first-team coach.
Both men were at last night's game and were watching from the stands, with Matt Gill and Bryan Klug in charge of the side as the Blues beat Accrington 2-1.
We've got all the best pictures here, courtesy of photographer Warren Page.
New manager Paul Cook with Gary Roberts at Accrington (Image: Pagepix Ltd.07976 935738)
New |Ipswich Town manager Paul Cook at Accrington (Image: Pagepix Ltd.07976 935738)
New manager Paul Cook with Gary Roberts talks to Bryan Klug at Accrington (Image: Pagepix Ltd.07976 935738)
New Ipswich Town Manager Paul Cook makes his way to the dressing rooms at the final whistle at Accrington (Image: Pagepix Ltd.07976 935738)
New Ipswich Town Manager Paul Cook gives a little fist bump to his new players outside the dressing rooms at the at Accrington (Image: Pagepix Ltd.07976 935738)
Ipswich Town caretaker boss Matt Gill, pictured in front of new manager Paul Cook. Photo: Pagepix (Image: Pagepix Ltd.07976 935738)
New Ipswich Town manager Paul Cook at Accrington Stanley on Tuesday night. Photo: Pagepix (Image: Pagepix Ltd.07976 935738)
New Ipswich Town Manager Paul Cook with Gary Roberts at Accrington Stanley on Tuesday night (Image: Pagepix Ltd.07976 935738)
New Ipswich Town boss Paul Cook (right) and first team coach Gary Roberts at Accrington Stanley on Tuesday night. Photo: Pagepix (Image: Pagepix Ltd.07976 935738)
New Ipswich Town Manager Paul Cook at Accrington Stanley on Tuesday night (Image: Pagepix Ltd.07976 935738)
Ipswich Manager Paul Cook has a smile for tor the referee after the game at Accrington Stanley on Tuesday night (Image: Pagepix Ltd.07976 935738)
New Ipswich Town Manager Paul Cook at Accrington Stanley on Tuesday night (Image: Pagepix Ltd.07976 935738)
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