Curran (pictured), who has been with the group for over 20 years, was appointed managing director of mortgages at Bank of Scotland in 2006 and director of intermediaries for Lloyds in 2010.
He will leave Lloyds on 30 April with Ian Wilson, current head of Halifax Intermediary, due to act as interim director of strategic partnerships.
In his new role, Curran will report directly to Nigel Stockton, financial services director at Countrywide.
Stockton said: “We are delighted to have a career professional with over 20 years’ experience of the banking industry, and it is further evidence of the importance we place on the relationship we have with the sector.
“Peter brings considerable experience and expertise to add to our growing financial services business.”
Mike Jones, director of intermediaries and MD, Scottish Widows Bank, said: “Peter has been with the Group for over 20 years in a variety of roles and has played, in the last 10, an integral part in the success of our mortgage business.
“Peter has been a particularly influential in the development of the UK mortgage market through the recession and in its rapid recovery since. He has shown significant leadership internally and externally and been key to designing, implementing and leading our mortgage strategy over this time.”