Toland, who became daa chief executive in January 2013, will join ARYZTA following a six-month notice period, or earlier if agreed.
Daa chairman, Pádraig Ó'Ríordáin, said it had been “a privilege to work with Kevin” over the past four and a half years.
“Kevin has worked tirelessly and with great vision to redevelop strategically the management structure and business approach of the Group, with compelling results," said Ó'Ríordáin.
"Under Kevin’s leadership, Dublin Airport was the fastest-growing major airport in Europe last year, Cork Airport is back to robust growth and our international businesses have expanded strongly.
"Kevin has contributed so much. We wish him every success in his new role and look forward to continuing to work closely with him over the remainder of his term.”
The Board of daa will now begin the process of identifying a new chief executive, Ó'Ríordáin added.
“It has been an absolute honour to lead daa, and I will remain fully focussed on the business in the months ahead,” noted Toland.
“I have greatly enjoyed working with staff and management. I have learned so much from my time with daa and am so proud of the fantastic job that our staff do for our customers and passengers across the globe on a daily basis.”