Nik Nazmi, 31, the PKR lawmaker for Seri Setia state, was charged in the Petaling Jaya Sessions court.
Authorities had declared the May 8 opposition rally, attended by more than 50,000 supporters, illegal. The rally was called by opposition leader Anwar Ibrahim to protest against the poll results.
The ruling coalition of Barisan Nasional won the polls by a simple majority to retain its 56-year hold on the power.
