James Goddard, one of the protesters involved in the incident outside Parliament with Tory MP Anna Soubry, has been charged with harassment and two public order offences.
The Crown Prosecution Service said the 29-year-old is accused of two counts of harassment relating to incidents on December 19 and January 7.
He is also accused of two public order offences against a police officer.
A CPS spokesman said: "Following a review of the evidence, the CPS has authorised the police to charge James Goddard, 29, with harassment.
“He is also charged with two public order offences against a police officer."
The self-styled "yellow vest" activist posted a video on Facebook on Tuesday to thank his supporters after being warned he was likely to be remanded in custody when he answered police bail.
He said: "If they do remand me then we will just have to learn from it, go away, do it, come back even stronger."
Goddard will appear at Westminster Magistrates Court on March 19.
The CPS said it had received a file of evidence on February 5 from the Metropolitan Police relating to two incidents outside Parliament on December 19 and January 7 involving an MP.