The PSNI is questioning 11 people at the interrogation centre in connection with the recent murders of two British soldiers and a police officer.
The protestors included some relatives of those being questioned and they called for their immediate release.
Two of the 11 being questioned have now been held for nine days and the PSNI can continue asking for extensions to the detention period up to a maximum of 28 days.
The groups represented at the protest included the 32 County Sovereignty Movement, Republican Sinn Féin and the Republican Network for Unity.
They remained for nearly an hour in front of the police station holding placards before dispersing without incident.
There was a PSNI presence and after the protest had finished, two cars containing some of the protestors were held for a time and searched at a police checkpoint on the Randalstown Road outside Massareene Barracks, close to the scene of the shooting of the two soldiers from the engineer regiment.
DUP MP for South Antrim Reverend William McCrea condemned the protest as despicable and said it was designed to cause maximum offence to people throughout the community.
He said those responsible for it had no support whatsoever and that the police had the full support of the community in Antrim.
He also defended the introduction of legislation at Westminster allowing suspects to be detained for questioning for up to 28 days before being charged or released.
The funeral of the second soldier Sapper Patrick Azimkar is due to be held in London tomorrow.
