Fr Michael Kelly (89) from Co. Offaly conferred with the Order of Distinguished Service for his work in developing strategies for HIV prevention.
Figures released by the HSE in June showed that new HIV cases in Ireland have reached their highest point in five years.
"Dedicated and doggedly persistent, she was an example of God-centred religious life."
“We need to stamp out the stigma that still exists around HIV" - Lord Mayor of Dublin Christy Burke.