Walch, who spent three years as a senior special advisor to business secretary Vince Cable during the coalition Government, previously worked in a range of other roles for the Liberal Democrats and for agency Blue Rubicon.
She joins the BBA as the sector looks to rebuild trust seven years on from the global economic crash which tarnised its reputation - as explored by Catherine Lafferty in the September edition of PRWeek, out this week.
She will be responsible for the BBA’s communications programme, UK and EU government affairs strategy, website and publications.
Walch said: "I am delighted to be joining the BBA at such an interesting time for the industry. The banking sector has gone through some fundamental reforms in the last few years and the fast pace of innovation promises much more for customers."
"I’m really looking forward to working with our excellent team here to help the public and policy makers understand how things have changed as well as how we will take on the challenges of the future."
Walch's appointment follows the recruitment of new senior press officer Sanjay Odedra, who previously worked as a senior press officer at the House of Commons, including with its Treasury Select Committee. He also previously worked in the press office of the City of London Corporation.