The deal announced today coincides with Powerade GreatCity Games in Manchester this weekend.
Ennis has won gold at the IAAF World Championships and IAAF Indoor World Championships and has been tipped to be the face of London 2012.
Running until the end of 2012, the deal will see Ennis appear in above-the-line marketing activity and brand endorsements.
Ennis will compete against Olympic Gold medallist Christine Ohuruogu at the event this weekend, in a unique 150m race held on specially laid track on the street in Manchester's city centre.
Powerade is the official sports drink of the FIFA World Cup, London2012, Team GB, the RFU and the Football League.
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