Smith’s existing contract was set to come to an end in March 2012 after four years at the helm.
A successor is expected to be appointed by October, the FSA added.
“Running the FSA has been the most rewarding job in my career in the food sector. I am proud that this Agency plays such an essential role in protecting the public – with effective and proportionate regulation and the provision of clear information to consumers on safe food and healthy eating,” said Smith.
“It is a privilege to work with so many very able, dedicated colleagues whether on the science, the policy development or the operation delivery of food safety.”