| The hosts kept up their challenge for the Magners League title despite suffering a double blow early on with both Andy Lloyd and Lyn Jones forced from the field with injuries.
But the Ospreys rallied and Hook gave them the lead with the first try of the game which he also converted.
Munster bounced back from that set back almost immediately with scrum half Tomas O'Leary exploiting a gap in the defence before feeding Donnacha Ryan for a try.
Hook extended the home side's advantage with a penalty on the half hour mark and he added another soon after when Munster lock Donncha O'Callaghan was sin-binned for killing the ball.
As a result Ospreys led 13-5 as the sides headed into the break.
Ospreys introduced Adam Jones, Justin Marshall and Barry Williams in the second period in the hope of provided a spark after they had lost their way and the trio had the desired effect.
Marshall darted over for his side's second try that Hook converted to give Ospreys a comfortable 15-point lead.
With Ospreys down the 14 men with the sin-binning of hooker Barry Williams the visitors had the last say with a breakaway try from winger Brian Carney that was converted by Ronan O'Gara.
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