James Sorene, currently the Department of Health's head of news, will also act as the embattled Deputy Prime Minister's spokesman.
The role will involve working with Clegg's political spokesman James McGrory and chief of staff Lena Pietsch.
A Cabinet Office spokesman said: ‘James brings extensive experience of Government communications, most recently as head of news at the Department of Health.
‘Like every government department, the Cabinet Office is looking to reduce its communications budget, so this appointment will be met within existing resource limits.’
The spokesman added that Sorene would join 'in due course'.
PRWeek revealed last month that the Cabinet Office was seeking the first official head of comms for a deputy prime minister.
The appointment follows a review of the support being provided to Clegg, conducted by Cabinet Secretary Sir Gus O'Donnell, which found his office is underpowered in strategic comms.