Miranda Watson replaces David Horton at the lung health charity. He moved on in April to launch his own PR agency, Horton Consultants.
Watson joins from her post as head of advocacy for social policy at Which?
She said: 'The British Lung Foundation provides an amazing range of support for the millions of people with breathing problems across the UK. The planned changes to the NHS will make the services provided by the BLF more valuable than ever.
'I am excited about taking on the challenge of making more people aware of all the help we offer.'
The British Lung Foundation is the only UK charity working for everyone affected by lung disease.
Watson has already started work at the charity. In her previous role at Which? she was responsible for managing all campaign and advocacy work on food, health, energy and the environment, at a UK and European level. Watson has also worked at Edelman.
Respiratory disease is the second biggest killer in the UK, responsible for one in five deaths in the UK. One person in every seven in the UK is affected by lung disease - this equates to approximately eight million people.
Last July, the British Lung Foundation launched Mesothelioma Day 2010, by urging people doing DIY to be 'Asbestos Aware'.