She replaces Franklin Servan-Schreiber, who left in January last year.
Reporting to IOC president Jacques Rogge and director-general Francois Carrard, Davies will head a team of two and be responsible for all international communications, except sponsorship, which is overseen by the marketing division.
Carrard will continue to oversee communications until Davies arrives in Lausanne.
'I am not going in with any specific brief. I will be attending an IOC conference in Kuala Lumpur in late May, which will give me the chance to talk and meet with delegates,' she said.
'I will be looking and learning first before thinking about issues affecting the IOC,' added Davies, who has been with Jordan for five years, joining as head of press and PR and then developing the department to become head of corporate comms.
She is a Grand Prix PR circuit veteran, having worked also for Benetton Ford F1.
Her earlier communications experience was with the then Scope Sponsorship, now Ketchum, where she worked on various accounts including the Oxford and Cambridge Boat Race.
Jordan is expected to restructure its comms department and has started its search for another head of press and PR to replace Davies.
It is understood Jordan has already been looking for a replacement, knowing Davies' departure was imminent.
The IOC was plunged into controversy a year ago following allegations of vote-rigging during Rogge's election.