ST Olaf's National School
Dublin 16 · Roll number 19319O
- Catholic ethos
- Not DEIS
- Pupils in 2025/26
- 591
- +18 on 2024/25
- Over 10 years
- +30%
- Up 138 from 453 in 2015/16
- 16 classes in 2015/16, 23 now; average class 28.3 → 25.7
- Over 20 years: +73% from 342 in 2005/06
- Girls and boys
- 284 / 307
- 48% girls
Pupils since 1974
Total enrolment each school year
Shaded: the last 10 years, 2015/16 to 2025/26. 1983/84 is left out because its source file is incomplete, and no files exist for 1984/85 to 1992/93. Known data issues
Pupils by class
Published for each class from 2020/21.
This year, 2025/26
591 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 | 79 | 81 | 68 | 73 | 66 | 74 | 73.5 |
| Senior Infants | 77 | 76 | 80 | 70 | 76 | 73 | 75.3 |
| 1st Class | 55 | 75 | 75 | 80 | 73 | 75 | 72.2 |
| 2nd Class | 60 | 53 | 74 | 79 | 83 | 75 | 70.7 |
| 3rd Class | 81 | 58 | 54 | 78 | 82 | 81 | 72.3 |
| 4th Class | 57 | 78 | 59 | 54 | 79 | 81 | 68.0 |
| 5th Class | 57 | 58 | 76 | 62 | 53 | 81 | 64.5 |
| 6th Class | 55 | 54 | 58 | 78 | 61 | 51 | 59.5 |
JI and SI are Junior and Senior Infants.
Started Junior Infants in 2024/25
66 in Junior Infants (2024/25), 73 in Senior Infants (2025/26): 7 pupils more.
- 66Junior Infants2024/25
- 73Senior Infants2025/26
Started Junior Infants in 2023/24
73 in Junior Infants (2023/24), 75 in 1st Class (2025/26): 2 pupils more.
- 73Junior Infants2023/24
- 76Senior Infants2024/25
- 751st Class2025/26
Started Junior Infants in 2022/23
68 in Junior Infants (2022/23), 75 in 2nd Class (2025/26): 7 pupils more.
- 68Junior Infants2022/23
- 70Senior Infants2023/24
- 731st Class2024/25
- 752nd Class2025/26
Started Junior Infants in 2021/22
81 in Junior Infants (2021/22), 81 in 3rd Class (2025/26): no change.
- 81Junior Infants2021/22
- 80Senior Infants2022/23
- 801st Class2023/24
- 832nd Class2024/25
- 813rd Class2025/26
Started Junior Infants in 2020/21
79 in Junior Infants (2020/21), 81 in 4th Class (2025/26): 2 pupils more.
- 79Junior Infants2020/21
- 76Senior Infants2021/22
- 751st Class2022/23
- 792nd Class2023/24
- 823rd Class2024/25
- 814th Class2025/26
In Senior Infants in 2020/21
77 in Senior Infants (2020/21), 81 in 5th Class (2025/26): 4 pupils more.
- 77Senior Infants2020/21
- 751st Class2021/22
- 742nd Class2022/23
- 783rd Class2023/24
- 794th Class2024/25
- 815th Class2025/26
In 1st Class in 2020/21
55 in 1st Class (2020/21), 51 in 6th Class (2025/26): 4 pupils fewer.
- 551st Class2020/21
- 532nd Class2021/22
- 543rd Class2022/23
- 544th Class2023/24
- 535th Class2024/25
- 516th Class2025/26
In 2nd Class in 2020/21
60 in 2nd Class (2020/21), 61 in 6th Class (2024/25): 1 pupil more.
- 602nd Class2020/21
- 583rd Class2021/22
- 594th Class2022/23
- 625th Class2023/24
- 616th Class2024/25
In 3rd Class in 2020/21
81 in 3rd Class (2020/21), 78 in 6th Class (2023/24): 3 pupils fewer.
- 813rd Class2020/21
- 784th Class2021/22
- 765th Class2022/23
- 786th Class2023/24
In 4th Class in 2020/21
57 in 4th Class (2020/21), 58 in 6th Class (2022/23): 1 pupil more.
- 574th Class2020/21
- 585th Class2021/22
- 586th Class2022/23
In 5th Class in 2020/21
57 in 5th Class (2020/21), 54 in 6th Class (2021/22): 3 pupils fewer.
- 575th Class2020/21
- 546th Class2021/22
Biggest one-year changes in a class
- +285th Class in 2025/26 (53 to 81)
- −233rd Class in 2021/22 (81 to 58)
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 ST Olaf's 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
31.6teaching posts
Our estimate: about 32 teachers.
- Class teachersOne for each of the 23 mainstream classes 23
- 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 teachers165 hours of support teaching a week 6.6
9 special needs assistants (SNAs) also work with pupils.
The NCSE has allocated 6.9 special education teachers and 9 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. 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 ST Olaf's National School, measured in a straight line. Pupil numbers are for 2025/26.
| Number on map | School | Distance | Pupils | Since 2015/16 |
|---|---|---|---|---|
| ST Olaf's National SchoolThis school | – | 591 |
+30.5%
|
|
| 1 | Queen of Angels Primary School0.7 km · Dublin 16 · DEIS | 0.7 km | 224 |
−10.8%
|
| 2 | S N Cnoc Ainbhil0.9 km · Stillorgan · Girls | 0.9 km | 434 |
−6.9%
|
| 3 | Ballinteer Educate Together National School1.0 km · Dublin 16 · Multi-denominational | 1.0 km | 399 | – |
| 4 | Taney N S1.0 km · Dublin 14 · Church of Ireland | 1.0 km | 384 |
−12.3%
|
| 5 | Holy Cross N S1.2 km · Dublin 14 | 1.2 km | 260 |
+11.6%
|
| 6 | St Raphaelas N S1.4 km · Blackrock · Girls | 1.4 km | 375 |
−20.4%
|
What parents would prefer
In the Department of Education and Youth's Primary School Survey (November–December 2025), parents said whether they would prefer this school to be co-educational or single-sex, to have a denominational or multi-denominational patron, and to teach through Irish or English. These are preferences, not applications or enrolments.
Children at this school
Their parents: 161 of 419 households answered (38%). The true figures are likely within 6.4 points either way.
Patron
Teaching language
Boys and girls
Children not yet at school
Their parents: 61 who intend to enrol a child here answered. The Department gives no margin of error for this group.
Patron
Teaching language
Boys and girls
The bracket shows the margin of error the Department published for this school: 6.4 points either way.
| Parents of | Multi-denominational | Through Irish | Single-sex |
|---|---|---|---|
| This school · children at school | 55% | 12% | 3% |
| This school · children not yet at school | 66% | 11% | 7% |
| Goatstown–Stillorgan–DLR planning area · children at school | 56% | 18% | 13% |
| Goatstown–Stillorgan–DLR planning area · children not yet at school | 65% | 20% | 11% |
| Ireland · children at school | 44% | 20% | 5% |
| Ireland · children not yet at school | 47% | 26% | 6% |
Source: Department of Education and Youth, Primary School Survey results, published 23 June 2026. Planning-area and Ireland figures also count parents at schools where too few answered for the school to get its own results. About these figures
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
- John Murtagh
- Phone
- 012956513
- [email protected]
- Address
- Balally Drive, Dundrum, Dublin 16, D16 E067
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
- Goatstown–Stillorgan–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
41 school years from 1974/75 to 2025/26. Class figures start in 2020/21.
| Year | Total | Girls | Boys | JI | SI | 1st | 2nd | 3rd | 4th | 5th | 6th |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/26 | 591 | 284 | 307 | 74 | 73 | 75 | 75 | 81 | 81 | 81 | 51 |
| 2024/25 | 573 | 263 | 310 | 66 | 76 | 73 | 83 | 82 | 79 | 53 | 61 |
| 2023/24 | 574 | 264 | 310 | 73 | 70 | 80 | 79 | 78 | 54 | 62 | 78 |
| 2022/23 | 544 | 255 | 289 | 68 | 80 | 75 | 74 | 54 | 59 | 76 | 58 |
| 2021/22 | 533 | 247 | 286 | 81 | 76 | 75 | 53 | 58 | 78 | 58 | 54 |
| 2020/21 | 521 | 235 | 286 | 79 | 77 | 55 | 60 | 81 | 57 | 57 | 55 |
| 2019/20 | 509 | 229 | 280 | – | – | – | – | – | – | – | – |
| 2018/19 | 494 | 226 | 268 | – | – | – | – | – | – | – | – |
| 2017/18 | 488 | 222 | 266 | – | – | – | – | – | – | – | – |
| 2016/17 | 484 | 232 | 252 | – | – | – | – | – | – | – | – |
| 2015/16 | 453 | 221 | 232 | – | – | – | – | – | – | – | – |
| 2014/15 | 444 | 209 | 235 | – | – | – | – | – | – | – | – |
| 2013/14 | 440 | 207 | 233 | – | – | – | – | – | – | – | – |
| 2012/13 | 443 | 224 | 219 | – | – | – | – | – | – | – | – |
| 2011/12 | 424 | 207 | 217 | – | – | – | – | – | – | – | – |
| 2010/11 | 424 | 208 | 216 | – | – | – | – | – | – | – | – |
| 2009/10 | 415 | 204 | 211 | – | – | – | – | – | – | – | – |
| 2008/09 | 387 | 186 | 201 | – | – | – | – | – | – | – | – |
| 2007/08 | 381 | 181 | 200 | – | – | – | – | – | – | – | – |
| 2006/07 | 353 | 167 | 186 | – | – | – | – | – | – | – | – |
| 2005/06 | 342 | 165 | 177 | – | – | – | – | – | – | – | – |
| 2004/05 | 329 | 150 | 179 | – | – | – | – | – | – | – | – |
| 2003/04 | 312 | 137 | 175 | – | – | – | – | – | – | – | – |
| 2002/03 | 326 | 157 | 169 | – | – | – | – | – | – | – | – |
| 2001/02 | 330 | 155 | 175 | – | – | – | – | – | – | – | – |
| 2000/01 | 331 | 152 | 179 | – | – | – | – | – | – | – | – |
| 1999/00 | 340 | 164 | 176 | – | – | – | – | – | – | – | – |
| 1998/99 | 389 | 182 | 207 | – | – | – | – | – | – | – | – |
| 1997/98 | 404 | 185 | 219 | – | – | – | – | – | – | – | – |
| 1996/97 | 403 | 179 | 224 | – | – | – | – | – | – | – | – |
| 1995/96 | 403 | 180 | 223 | – | – | – | – | – | – | – | – |
| 1994/95 | 397 | 176 | 221 | – | – | – | – | – | – | – | – |
| 1993/94 | 404 | 171 | 233 | – | – | – | – | – | – | – | – |
| 1983/84 | 578 | 280 | 298 | – | – | – | – | – | – | – | – |
| 1982/83 | 608 | 300 | 308 | – | – | – | – | – | – | – | – |
| 1981/82 | 659 | 334 | 325 | – | – | – | – | – | – | – | – |
| 1980/81 | 694 | 362 | 332 | – | – | – | – | – | – | – | – |
| 1977/78 | 623 | 381 | 242 | – | – | – | – | – | – | – | – |
| 1976/77 | 595 | 382 | 213 | – | – | – | – | – | – | – | – |
| 1975/76 | 355 | – | – | – | – | – | – | – | – | – | – |
| 1974/75 | 256 | 256 | 0 | – | – | – | – | – | – | – | – |