None of the complaints the Garda Ombudsman received in relation to the policing of water protests resulted in criminal charges against gardaí, according to GSOC's annual report.
The report, which was published today, says it received 40 complaints, 29 of which were inadmissible.
Disciplinary proceedings were recommended in one case after the DPP directed no prosecution.
Most of the complaints concerned allegations of assault, excessive force, neglect of duty or abuse of authority and most relate to incidents in north Dublin during September 2014 and August 2015.
GSOC said it obtained evidence on social media and footage from Garda body cameras which it said showed in the majority of cases no clear evidence of garda misconduct and in some cases that the actions of the gardaí concerned were proportionate.
It also found that over a third of those who made complaints did not subsequently cooperate with the GSOC investigations or withdrew their complaints, making investigation difficult.
The report also showed of the 2,000 complaints received last year just over 1,100 were admissible.
The most common issues were abuse of authority and neglect of duty.
GSOC also said it was concerned that public attitudes research it commissioned showed that only half of the population surveyed expressed confidence in its ability to resolve problems.
The Commission says that some complaints made to it, in particular those that relate to the quality of the service provided by individual gardaí, are best addressed through a managerial rather than a disciplinary response.
It says this would enhance the ability of the Garda Síochána to develop their personnel to respond and engage with the public in an appropriate fashion.