The undercover reporter known as the "Fake Sheikh" has been charged with conspiring to pervert the course of justice after the collapse of the drugs trial of pop star Tulisa Contostavlos.
Mazher Mahmood, a former reporter on the News of the World, is alleged to have misled the court, the Crown Prosecution Service said.
In a statement issued through his lawyers, Mahmood said: "I am deeply disappointed that, after a totally unjustified delay, the Crown Prosecution Service have today informed me that they have decided to charge me with conspiracy to pervert the course of justice.
"I deny the offence. I will vigorously contest it at court. In the meantime I have nothing further to say."