Stratton is Newsnight political editor
Allegra Stratton is to return to Newsnight, succeeding Michael Crick in the key post of political editor.
The Guardian political correspondent is a former Newsnight producer who also worked on Andrew Marr's talk show on BBC Four and This Week.
Accepting the position at the BBC flagship television news programme Allegra said: 'It's a privilege to be returning to Newsnight. It is a great programme with an important role in stimulating political debate, especially at such a turbulent time both here and abroad.
'I'm very sad, though, to be leaving The Guardian. I'm proud to have worked there and have benefited immensely from the wisdom, kindness and good humour of my colleagues.'
Newsnight editor Peter Rippon said he was delighted to welcome 'such a talented journalist as Allegra to the team'.
'The Newsnight political editor is a cornerstone of the programme and Allegra's appointment is crucial to our continuing success,' he said.
'Our audiences expect us to hold Westminster to account and to bring them the inside stories and with Allegra's experience I have every confidence she will be able to fulfil their expectations.'
Michael Crick left the job to join Channel 4 News in July as political correspondent.