Dublin City University has dropped 51 places in the latest world rankings.
The north Dublin college now sits at number 258 in the latest QS study.
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Trinity College remains the country's top institution, placing 101st for the second year running.
UCD has risen 4 places to 173.
Half Of Irish Universities Slip Down Ranking
Overall, half of Ireland's universities dropped places in the list.
Maynooth and UCC slipped down the rankings.
NUIG dropped 20 places to 258 while the University of Limerick now sits just outside the top 500.
Jack Moran is a spokesperson for QS and he says investment is a key issue for Irish universities.
"You need to hire qualified faculty to teach increasing numbers of students," he said.
"And of course, doing higher quality, impactful research also requires the financial, infrastructure and resources to do so."