Liam O’Hanna, or Liam Og O Hannaidh, has been charged with displaying a flag in support of Hezbollah, a proscribed organisation, the Metropolitan Police said.
The 27-year-old from Belfast – who performs under the stage name Mo Chara – is due to appear at Westminster Magistrates’ Court on 18 June.
It comes after counter-terror police assessed a video reported to be from a Kneecap concert.
The charge relates to a flag that O’Hanna allegedly displayed at the O2 Forum in Kentish Town, London, on 21 November last year.
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Officers from the Met’s Counter Terrorism Command were made aware of a video circulating online on 22 April, the force said.
An investigation led to the Crown Prosecution Service authorising the charge.
