And more than a fifth of 18- to 24-year-olds are "unsure" if they will accept a jab.
The findings show a significant amount of vaccine hesitancy among younger age groups.
The survey, carried out by Ipsos MRBI, is part of a tracker poll for the Irish Pharmaceutical Healthcare Association (IPHA), which represents the international research-based biopharmaceutical industry.
It found the percentage of the population willing to take a Covid-19 vaccine has risen to 85pc overall, up from 75pc in January.
The number of people who intend to get vaccinated - including 12pc in the survey who said they had already got the jab - is at its highest yet.
Around 10pc are "unsure" - down from 18pc earlier this year.
Pockets of hesitancy remain, with 6pc saying they will refuse a vaccine when offered - down from 7pc.
Reluctance to get vaccinated is highest among 25- to 34-year-olds, 10pc of whom would refuse one if offered.
Among 18- to 24-year-olds, one in five say they are "unsure" if they will get vaccinated, while 6pc said they would refuse it.
Younger age groups are at much lower risk from Covid-19 but they can suffer long Covid symptoms after a bout of the virus and can also pass on the infection to other, more vulnerable, age groups.
Figures from the HSE show that, so far, a quarter of the population here has had a first dose and around one in 10 is fully vaccinated with two doses.
The National Immunisation Advisory Committee, which draws guidelines on Covid-19 vaccines, will make recommendations this week on how the one-shot Johnson & Johnson jab be used here.
It has been linked to a very small risk of unusual blood clots. It is expected to be restricted to younger age groups, although the cut-off point is unclear.
There are also likely to be new guidelines on the AstraZeneca vaccine, which is also linked to blood clots and currently confined to people in their 60s.
Following a new report from the European Medicines Agency on age-related risk, the AstraZeneca vaccine may be made available to people under 60 although not to much younger age groups.
The intention to take a vaccine is higher among older age groups and some in these groups have already been vaccinated.
Bernard Mallee, director of communications and advocacy at the IPHA, said it is encouraging that the public's appetite to get vaccinated for has been steadily increasing since the start of the year.
"There is no room for complacency though," he said.
"We must keep facts to the forefront."