Almost two thousand complaints were received by the Garda Síochána Ombudsman Commission last year, a 10% increase on 2016.
The most common matters complained of were abuse of authority, neglect of duty, discourtesy, and non-fatal offences such as assault, harassment or false imprisonment.
The GSOC annual report for 2017 shows that 1,949 complaints were received last year.
There were 24 referrals received from the gardaí of matters where it appeared that "the conduct of a member of An Garda Síochána may have resulted in the death of, or serious harm to, a person".
Seven of these referrals related to fatalities.
The report highlighted that GSOC had been sanctioned by the Department of Justice to recruit five additional staff for a protected disclosures unit.
None of these staff had taken up their roles by the end of last year.
GSOC also began an investigation last year into alleged mismanagement of funds allocated for policing projects and financial irregularities at the Garda College in Templemore.