There were also 70 assaults by prisoners on staff.
There were 320 assaults in Irish prisons last year.
250 involved prisoners attacking other inmates - with 64 in Cork jail, 44 in Castlerea in Roscommon, and 29 in Midlands Prison in Portlaoise.
Almost four out of every five involved prisoner-on-prisoner attacks.
Eoghan Murphy reports:
There were also 70 assaults by prisoners on staff.
Jim Mitchell, from the Prison Officers Association, says several staff have suffered serious injuries over the years
.

Investigations Continue Into Beauty Brands Sephora And Benefit Over Marketing Issues
Parents Association Call For Urgent Action Over "Unsafe" Maynooth School Car Park
Minister Martin Heydon Calls On EU To Be Flexible On Levies For Fertiliser
Gardai Have Arrested 3 People In Relation To Man Last Seen Alive In Monasterervin In 2019
80% of Public Sector Workers Cutting Back On Essentials, Survey Finds
Naas Clinic Among Highest Earners From Medical Cert Scheme
Kildare-Based Animal Rescue Group Continue Calls To Ban Sulky Racing On Public Roads
National Homeless Figures Increased By Almost 200 In February