Mr Fitzgerald, who is currently chief executive at Sunderland City Council, replaces Chris Trinick who is retiring after six years in charge.
Lancashire leader Hazel Harding (Lab) welcomed the appointment. She said: “Mr Fitzgerald has a proven track record of achievement particularly in cultural change, customer focus, regeneration and partnership working - all of which are at the top of our agenda.”
Mr Fitzgerald, 46, said: “I am delighted to lead such an ambitious and excellent organisation. I hope to build on the achievements and improvements already made, while recognizing that there is much still to be done.”
Mr Fitzgerald's background
Mr Fitzgerald's local government career began at Sefton MBC. He then worked for several Merseyside authorities before being appointed as head of economic development and European affairs, and director of city challenge at Liverpool City Council in 1996.