LONDON — The radical preacher Anjem Choudary, some of whose followers have joined the Islamic State, was charged by the British authorities on Wednesday with inciting support for the organization.

Mr. Choudary was charged alongside an associate, Mohammed Mizanur Rahman, with “inviting support” for the Islamic State from June 29, 2014, to March 6 of this year, the Metropolitan Police in London said. Both men were set to appear at Westminster Magistrates’ Court on Wednesday.

The two men are accused of advocating on behalf of the Islamic State, also known as ISIS or ISIL, in “individual lectures which were subsequently published online,” said Sue Hemming, head of the counterterrorism division at the Crown Prosecution Service.

“We have concluded that there is sufficient evidence and it is in the public interest to prosecute Anjem Choudary and Mohammed Rahman for inviting support for ISIL,” she said, without offering additional details.