Starting as head of media relations next month, Tofield will work at the Cabinet Office and the Prime Minister’s Office and focus on improving the standard of media work.
The job has been created as part of an ongoing programme of reforms that followed the communications capability reviews across Whitehall and led to the creation of the Government Communications Service.
As part of the role Tofield, currently deputy director of communications at the Cabinet Office, will provide support to departments on high-profile domestic and international operational issues where a government-wide response is required.
She will also focus on improving regional coverage and setting new standards of cross-government media practice.
Tofield, who who recently returned from maternity leave, reports to executive director of government communications Alex Aiken.
Aiken said: "We want to provide the best support to media teams across Government and to improve our professional practice and Emily will take on this important new role to enable this to happen. This role will strengthen the Cabinet Office and Number 10 support to government communicators."
Before joining the Cabinet Office in 2009, Tofield previously worked in a range of roles across the BBC, including as a producer on The Andrew Marr Show.