Holy Trinity National School
Dublin 18 · Roll number 20190T
- Catholic ethos
- Not DEIS
- Pupils in 2025/26
- 586
- −10 on 2024/25
- Over 10 years
- +38%
- Up 160 from 426 in 2015/16
- Girls and boys
- 271 / 315
- 46% girls
Pupils since 2005
Total enrolment each school year
Shaded: the last 10 years, 2015/16 to 2025/26.
Pupils by class
Published for each class from 2020/21.
This year, 2025/26
586 pupils across 8 classes
Every class, every year
Darker cells have more pupils. A group of pupils moves down one class and right one year.
| 2020/21 | 2021/22 | 2022/23 | 2023/24 | 2024/25 | 2025/26 | Average | |
|---|---|---|---|---|---|---|---|
| Junior Infants | 82 | 74 | 77 | 76 | 73 | 75 | 76.2 |
| Senior Infants | 75 | 82 | 75 | 79 | 70 | 68 | 74.8 |
| 1st Class | 77 | 72 | 74 | 71 | 77 | 69 | 73.3 |
| 2nd Class | 81 | 82 | 73 | 76 | 74 | 76 | 77.0 |
| 3rd Class | 71 | 76 | 77 | 72 | 77 | 73 | 74.3 |
| 4th Class | 91 | 75 | 77 | 74 | 75 | 75 | 77.8 |
| 5th Class | 52 | 90 | 71 | 82 | 76 | 73 | 74.0 |
| 6th Class | 75 | 50 | 86 | 71 | 74 | 77 | 72.2 |
JI and SI are Junior and Senior Infants.
Started Junior Infants in 2024/25
73 in Junior Infants (2024/25), 68 in Senior Infants (2025/26): 5 pupils fewer.
- 73Junior Infants2024/25
- 68Senior Infants2025/26
Started Junior Infants in 2023/24
76 in Junior Infants (2023/24), 69 in 1st Class (2025/26): 7 pupils fewer.
- 76Junior Infants2023/24
- 70Senior Infants2024/25
- 691st Class2025/26
Started Junior Infants in 2022/23
77 in Junior Infants (2022/23), 76 in 2nd Class (2025/26): 1 pupil fewer.
- 77Junior Infants2022/23
- 79Senior Infants2023/24
- 771st Class2024/25
- 762nd Class2025/26
Started Junior Infants in 2021/22
74 in Junior Infants (2021/22), 73 in 3rd Class (2025/26): 1 pupil fewer.
- 74Junior Infants2021/22
- 75Senior Infants2022/23
- 711st Class2023/24
- 742nd Class2024/25
- 733rd Class2025/26
Started Junior Infants in 2020/21
82 in Junior Infants (2020/21), 75 in 4th Class (2025/26): 7 pupils fewer.
- 82Junior Infants2020/21
- 82Senior Infants2021/22
- 741st Class2022/23
- 762nd Class2023/24
- 773rd Class2024/25
- 754th Class2025/26
In Senior Infants in 2020/21
75 in Senior Infants (2020/21), 73 in 5th Class (2025/26): 2 pupils fewer.
- 75Senior Infants2020/21
- 721st Class2021/22
- 732nd Class2022/23
- 723rd Class2023/24
- 754th Class2024/25
- 735th Class2025/26
In 1st Class in 2020/21
77 in 1st Class (2020/21), 77 in 6th Class (2025/26): no change.
- 771st Class2020/21
- 822nd Class2021/22
- 773rd Class2022/23
- 744th Class2023/24
- 765th Class2024/25
- 776th Class2025/26
In 2nd Class in 2020/21
81 in 2nd Class (2020/21), 74 in 6th Class (2024/25): 7 pupils fewer.
- 812nd Class2020/21
- 763rd Class2021/22
- 774th Class2022/23
- 825th Class2023/24
- 746th Class2024/25
In 3rd Class in 2020/21
71 in 3rd Class (2020/21), 71 in 6th Class (2023/24): no change.
- 713rd Class2020/21
- 754th Class2021/22
- 715th Class2022/23
- 716th Class2023/24
In 4th Class in 2020/21
91 in 4th Class (2020/21), 86 in 6th Class (2022/23): 5 pupils fewer.
- 914th Class2020/21
- 905th Class2021/22
- 866th Class2022/23
In 5th Class in 2020/21
52 in 5th Class (2020/21), 50 in 6th Class (2021/22): 2 pupils fewer.
- 525th Class2020/21
- 506th Class2021/22
Biggest one-year changes in a class
- +385th Class in 2021/22 (52 to 90)
- −256th Class in 2021/22 (75 to 50)
Class sizes
Mainstream class groups, 2006/07 to 2025/26.
Why these won't match pupils by class
Mainstream class groups only. The source does not identify which standard/year group each class group belongs to. So these figures won't match the pupils-by-class figures exactly.
In 2025/26. Choose a figure to chart it.
Class sizes over time
Average class size, 2006/07 to 2025/26
Teachers
Who teaches at Holy Trinity National School, 2006/07 to 2025/26.
How we count teachers
Class teachers come from the Department of Education's class sizes: one for each mainstream class. Special education and special class teachers are the posts the National Council for Special Education (NCSE) allocates. We add a principal who doesn't teach a class where the Department's rules give the school one. These are posts, not people: part of a post can be a teacher shared with another school. Up to 2015/16 the Department counted every teacher itself. Known data issues
In 2025/26
34.6teaching posts
Our estimate: about 35 teachers.
- Class teachersOne for each of the 24 mainstream classes 24
- PrincipalRuns the school and doesn't teach a class 1
- Deputy principalDoesn't teach a class either, as larger schools and those with five or more special classes have one 1
- Special education teachers215 hours of support teaching a week 8.6
10.5 special needs assistants (SNAs) also work with pupils.
The NCSE has allocated 8.6 special education teachers and 10.5 SNAs for next year.
Teachers since 2006/07
Teachers each school year, by role
To 2015/16: the Department of Education's count of every teacher. From 2019/20: our estimate, from class sizes and the NCSE's allocations. Dashed boxes: no special education figures were published for those years, so only class teachers and the principal are shown. Where there's no principal bar, the principal also taught a class. Known data issues
Sources: Department of Education class sizes and teacher counts; NCSE school allocations and special classes (CC BY 4.0).
Nearby schools
The 6 primary schools closest to Holy Trinity National School, measured in a straight line. Pupil numbers are for 2025/26.
| Number on map | School | Distance | Pupils | Since 2015/16 |
|---|---|---|---|---|
| Holy Trinity National SchoolThis school | – | 586 |
+37.6%
|
|
| 1 | Gaelscoil Shliabh Rua0.8 km · Baile Átha Cliath 18 · Gaelscoil · Multi-denominational | 0.8 km | 359 |
+529.8%
|
| 2 | Gaelscoil Thaobh na Coille1.3 km · Baile Átha Cliath 18 · Gaelscoil | 1.3 km | 402 |
−9.0%
|
| 3 | Stepaside Educate Together National School1.4 km · Dublin 18 · Multi-denominational | 1.4 km | 542 |
+351.7%
|
| 4 | St Brigids Boys N S2.0 km · Dublin 18 · Boys | 2.0 km | 406 |
−20.9%
|
| 5 | Kilternan Church of Ireland NS2.1 km · Dublin 18 · Church of Ireland | 2.1 km | 206 |
−11.2%
|
| 6 | St. Mary's National School2.2 km · Dublin 18 | 2.2 km | 242 |
−6.6%
|
About this school
Inspection reports open on gov.ie, under the name the school had when it was inspected. They describe specific areas of the school's work rather than giving an overall grade. Newer schools may not have one yet.
Contact
- Principal
- James Tobin
- Phone
- 012063664
- [email protected]
- Address
- Glencairn, Leopardstown, Dublin 18, D18 YV91
School
- Ethos
- Catholic
- Patron
- Archbishop of Dublin
- School type
- Ordinary
- School level
- All Through
- DEIS
- Not DEIS
Language and area
- Irish classification
- No subjects through Irish
- Gaeltacht
- Non-Gaeltacht
- Island
- Not on an island
- Local authority
- Dun Laoghaire Rathdown
- Planning area
- Ballinteer–Stepaside–DLR
Each detail is the latest one the Department of Education has recorded for this school. If a detail was left blank in 2025/26, we show it from an earlier year, so some details may be older than the pupil numbers. Known data issues
Data by year
21 school years from 2005/06 to 2025/26. Class figures start in 2020/21.
| Year | Total | Girls | Boys | JI | SI | 1st | 2nd | 3rd | 4th | 5th | 6th |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/26 | 586 | 271 | 315 | 75 | 68 | 69 | 76 | 73 | 75 | 73 | 77 |
| 2024/25 | 596 | 274 | 322 | 73 | 70 | 77 | 74 | 77 | 75 | 76 | 74 |
| 2023/24 | 601 | 274 | 327 | 76 | 79 | 71 | 76 | 72 | 74 | 82 | 71 |
| 2022/23 | 610 | 290 | 320 | 77 | 75 | 74 | 73 | 77 | 77 | 71 | 86 |
| 2021/22 | 601 | 270 | 331 | 74 | 82 | 72 | 82 | 76 | 75 | 90 | 50 |
| 2020/21 | 604 | 268 | 336 | 82 | 75 | 77 | 81 | 71 | 91 | 52 | 75 |
| 2019/20 | 578 | 250 | 328 | – | – | – | – | – | – | – | – |
| 2018/19 | 531 | 220 | 311 | – | – | – | – | – | – | – | – |
| 2017/18 | 516 | 214 | 302 | – | – | – | – | – | – | – | – |
| 2016/17 | 475 | 204 | 271 | – | – | – | – | – | – | – | – |
| 2015/16 | 426 | 179 | 247 | – | – | – | – | – | – | – | – |
| 2014/15 | 375 | 158 | 217 | – | – | – | – | – | – | – | – |
| 2013/14 | 350 | 154 | 196 | – | – | – | – | – | – | – | – |
| 2012/13 | 295 | 127 | 168 | – | – | – | – | – | – | – | – |
| 2011/12 | 267 | 121 | 146 | – | – | – | – | – | – | – | – |
| 2010/11 | 213 | 97 | 116 | – | – | – | – | – | – | – | – |
| 2009/10 | 156 | 73 | 83 | – | – | – | – | – | – | – | – |
| 2008/09 | 103 | 42 | 61 | – | – | – | – | – | – | – | – |
| 2007/08 | 75 | 36 | 39 | – | – | – | – | – | – | – | – |
| 2006/07 | 46 | 23 | 23 | – | – | – | – | – | – | – | – |
| 2005/06 | 20 | 9 | 11 | – | – | – | – | – | – | – | – |