Urslaan Khan, 42, of Chrisp Street, Poplar, east London, appeared at the Old Bailey on Thursday.
He denied a single charged of expressing support for Hamas in a way that was “reckless as to whether a person to whom the expression was directed would be encouraged to support a proscribed organisation” during a protest last October 17.
The defendant was granted conditional bail ahead of a further hearing on May 30.
A provisional trial has already been set for August 12 at the Old Bailey.