The announcement follows a local newspaper report that some of the material in the emails were anti-semitic.
The staff, who work in different departments across County Hall, were suspended on April 9 and could be sacked if found guilty of gross misconduct.
A statement from Ged Fitzgerald, chief executive of Lancashire County Council, said: "I can confirm that 14 staff members have been suspended, pending an investigation into alleged inappropriate email use.
"At the county council, we believe all our staff have a duty to use email in a responsible manner, and our priority at this time is to ascertain the facts around the allegations and ensure that the right action is taken."
The report by the Lancashire Telegraph quoted Les Parker, from Unite as saying: “I have been here for 40-odd years, and I have never seen anything like this number of people suspended in one go.
"Usually it’s one person or maybe two, never ever in the teens like this."