The appointment of the former interim head of paid service, Debbie Barnes, to chief executive was approved at a meeting of the full council today.
Debbie has worked for the authority since 2006, becoming director of children's services in 2012.
During her time with the authority, she has played an instrumental role in transforming Lincolnshire's children's services into a beacon of excellence.
The service was rated as 'outstanding' by Ofsted earlier this year, with Lincolnshire leading on the development of social work practice nationally, helping Rotherham, Tower Hamlets and Northamptonshire to improve their services.
In 2018, Debbie was awarded an OBE in the Queen's Birthday Honours list in light of her contribution to children's services.
Debbie said: " I’m delighted to have been selected as chief executive of Lincolnshire County Council
"Born in Lincolnshire, I am passionate about our county’s prosperity. Lincolnshire is a great place to live, work, visit and bring up families.
"I'm thrilled to be able to work with our ambitious council and partners to deliver an exciting agenda for our county."