He will cover for BofE comms head Jenny Scott, who is on adoption leave for a year.
Blythe has worked with the BBC since 1988, most recently as the BBC business correspondent.
He has also presented BBC Business Today on BBC News 24 and was a reporter on The Money Programme and a business correspondent on Radio 4’s Today programme.
Scott is also a fomer BBC staffer, having joined the organisation as economics correspondent in 2000 from the BofE. She rejoined the Bank of England in 2008.