Largest Schools in Waterloo CDSB (2025)

Schools with the highest enrolment. Ranked by the Success Index (Canada) from official Canadian data; 49 schools in Waterloo CDSB, Ontario. Rank positions shown on each profile are within Canada and Ontario.

1
47
St Mary's High SchoolKitchener · Catholic SecondaryEnrolment: 2,240
2
53
St Benedict Catholic Secondary SchoolCambridge · Catholic SecondaryEnrolment: 1,955
3
50
Resurrection Catholic Secondary SchoolKitchener · Catholic SecondaryEnrolment: 1,920
4
52
Monsignor Doyle Catholic Secondary SchoolCambridge · Catholic SecondaryEnrolment: 1,115
5
73
St David Catholic Secondary SchoolWaterloo · Catholic SecondaryEnrolment: 1,080
6
60
St Josephine Bakhita Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 815
7
38
St Anne Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 750
8
58
John Sweeney Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 720
9
55
St Vincent de Paul Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 685
10
68
Saint John Paul II Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 655
11
31
St Agnes Catholic Elementary SchoolWaterloo · Catholic ElementaryEnrolment: 595
12
51
Holy Spirit Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 590
13
16
St Daniel Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 590
14
61
St Dominic Savio Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 565
15
43
Holy Rosary Catholic Elementary SchoolWaterloo · Catholic ElementaryEnrolment: 560
16
23
St Aloysius Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 550
17
72
St Gabriel Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 530
18
52
St Augustine Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 525
19
66
Canadian Martyrs Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 520
20
47
St Kateri Tekakwitha Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 510
21
72
St Luke Catholic Elementary SchoolWaterloo · Catholic ElementaryEnrolment: 505
22
36
St Paul Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 505
23
43
St Nicholas Catholic Elementary SchoolWaterloo · Catholic ElementaryEnrolment: 495
24
7
St John Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 460
25
47
Sir Edgar Bauer Catholic Elementary SchoolWaterloo · Catholic ElementaryEnrolment: 445
26
30
St Bernadette Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 435
27
87
St Matthew Catholic Elementary SchoolWaterloo · Catholic ElementaryEnrolment: 425
28
13
St Anne Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 425
29
59
St Elizabeth Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 415
30
49
Holy Family Catholic Elementary SchoolNew Hamburg · Catholic ElementaryEnrolment: 405
31
56
St Teresa of Calcutta Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 400
32
51
St Boniface Catholic Elementary SchoolMaryhill · Catholic ElementaryEnrolment: 400
33
20
Monsignor Haller Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 400
34
65
St Mark Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 390
35
37
Our Lady of Lourdes Catholic Elementary SchoolWaterloo · Catholic ElementaryEnrolment: 385
36
59
St Timothy Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 375
37
53
Our Lady of Fatima Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 375
38
78
St Brigid Catholic Elementary SchoolAyr · Catholic ElementaryEnrolment: 355
39
52
St Teresa Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 355
40
35
Our Lady of Grace Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 355
41
37
St Margaret Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 315
42
35
St Michael Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 310
43
19
St Peter Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 310
44
59
Blessed Sacrament Catholic Elementary SchoolKitchener · Catholic ElementaryEnrolment: 290
45
65
St Joseph Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 280
46
52
St Clement Catholic Elementary SchoolSt Clements · Catholic ElementaryEnrolment: 250
47
27
Christ The King Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 235
48
53
St Teresa of Avila Catholic Elementary SchoolElmira · Catholic ElementaryEnrolment: 225
49
18
St Gregory Catholic Elementary SchoolCambridge · Catholic ElementaryEnrolment: 145

#	School	Sector	Enrolment	Success Index (Canada)	Key result	Students
1	St Mary's High School Kitchener · Secondary · Grades 9-12	Catholic	2,240	47.4 Lower 50%	94% OSSLT pass rate	2,240
2	St Benedict Catholic Secondary School Cambridge · Secondary · Grades 9-12	Catholic	1,955	53.1 Top 50%	90% OSSLT pass rate	1,955
3	Resurrection Catholic Secondary School Kitchener · Secondary · Grades 9-12	Catholic	1,920	49.8 Lower 50%	90% OSSLT pass rate	1,920
4	Monsignor Doyle Catholic Secondary School Cambridge · Secondary · Grades 9-12	Catholic	1,115	51.8 Top 50%	92% OSSLT pass rate	1,115
5	St David Catholic Secondary School Waterloo · Secondary · Grades 9-12	Catholic	1,080	73.3 Top 25%	97% OSSLT pass rate	1,080
6	St Josephine Bakhita Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	815	59.8 Top 50%	76% EQAO Grade 6	815
7	St Anne Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	750	38.4 Lower 50%	72.3% EQAO Grade 6	750
8	John Sweeney Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	720	58.2 Top 50%	79.7% EQAO Grade 6	720
9	St Vincent de Paul Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	685	54.6 Top 50%	83.3% EQAO Grade 6	685
10	Saint John Paul II Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	655	68.4 Top 25%	88% EQAO Grade 6	655
11	St Agnes Catholic Elementary School Waterloo · Elementary · Grades JK-8	Catholic	595	31.2 Lower 50%	63.3% EQAO Grade 6	595
12	Holy Spirit Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	590	51.3 Top 50%	72.3% EQAO Grade 6	590
13	St Daniel Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	590	16.2 Lower 50%	65% EQAO Grade 6	590
14	St Dominic Savio Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	565	61.4 Top 50%	88% EQAO Grade 6	565
15	Holy Rosary Catholic Elementary School Waterloo · Elementary · Grades JK-8	Catholic	560	43.2 Lower 50%	78.3% EQAO Grade 6	560
16	St Aloysius Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	550	22.5 Lower 50%	62.7% EQAO Grade 6	550
17	St Gabriel Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	530	71.6 Top 25%	83.7% EQAO Grade 6	530
18	St Augustine Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	525	52.0 Top 50%	73.3% EQAO Grade 6	525
19	Canadian Martyrs Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	520	66.3 Top 50%	90.7% EQAO Grade 6	520
20	St Kateri Tekakwitha Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	510	46.8 Lower 50%	70% EQAO Grade 6	510
21	St Luke Catholic Elementary School Waterloo · Elementary · Grades JK-8	Catholic	505	72.0 Top 25%	86.3% EQAO Grade 6	505
22	St Paul Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	505	35.9 Lower 50%	71% EQAO Grade 6	505
23	St Nicholas Catholic Elementary School Waterloo · Elementary · Grades JK-8	Catholic	495	43.2 Lower 50%	70.3% EQAO Grade 6	495
24	St John Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	460	7.0 Lower 50%	56.3% EQAO Grade 6	460
25	Sir Edgar Bauer Catholic Elementary School Waterloo · Elementary · Grades JK-8	Catholic	445	47.3 Lower 50%	74.7% EQAO Grade 6	445
26	St Bernadette Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	435	30.0 Lower 50%	72.3% EQAO Grade 6	435
27	St Matthew Catholic Elementary School Waterloo · Elementary · Grades JK-8	Catholic	425	86.5 Top 5%	88.3% EQAO Grade 6	425
28	St Anne Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	425	12.6 Lower 50%	49.7% EQAO Grade 6	425
29	St Elizabeth Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	415	58.6 Top 50%	78% EQAO Grade 6	415
30	Holy Family Catholic Elementary School New Hamburg · Elementary · Grades JK-8	Catholic	405	48.8 Lower 50%	63.3% EQAO Grade 6	405
31	St Teresa of Calcutta Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	400	56.0 Top 50%	79% EQAO Grade 6	400
32	St Boniface Catholic Elementary School Maryhill · Elementary · Grades JK-8	Catholic	400	50.7 Lower 50%	67.3% EQAO Grade 6	400
33	Monsignor Haller Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	400	20.2 Lower 50%	59.3% EQAO Grade 6	400
34	St Mark Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	390	65.3 Top 50%	65% EQAO Grade 6	390
35	Our Lady of Lourdes Catholic Elementary School Waterloo · Elementary · Grades JK-8	Catholic	385	36.9 Lower 50%	70.3% EQAO Grade 6	385
36	St Timothy Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	375	58.7 Top 50%	80% EQAO Grade 6	375
37	Our Lady of Fatima Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	375	52.8 Top 50%	69.3% EQAO Grade 6	375
38	St Brigid Catholic Elementary School Ayr · Elementary · Grades JK-8	Catholic	355	78.2 Top 25%	89% EQAO Grade 6	355
39	St Teresa Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	355	51.6 Top 50%	74% EQAO Grade 6	355
40	Our Lady of Grace Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	355	34.7 Lower 50%	58% EQAO Grade 6	355
41	St Margaret Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	315	37.2 Lower 50%	66.7% EQAO Grade 6	315
42	St Michael Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	310	34.6 Lower 50%	60.3% EQAO Grade 6	310
43	St Peter Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	310	19.4 Lower 50%	69.7% EQAO Grade 6	310
44	Blessed Sacrament Catholic Elementary School Kitchener · Elementary · Grades JK-8	Catholic	290	59.2 Top 50%	70.7% EQAO Grade 6	290
45	St Joseph Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	280	64.8 Top 50%	83.3% EQAO Grade 6	280
46	St Clement Catholic Elementary School St Clements · Elementary · Grades JK-8	Catholic	250	51.7 Top 50%	76% EQAO Grade 6	250
47	Christ The King Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	235	26.7 Lower 50%	57.7% EQAO Grade 6	235
48	St Teresa of Avila Catholic Elementary School Elmira · Elementary · Grades JK-8	Catholic	225	52.8 Top 50%	71.3% EQAO Grade 6	225
49	St Gregory Catholic Elementary School Cambridge · Elementary · Grades JK-8	Catholic	145	17.6 Lower 50%	67.3% EQAO Grade 6	145

St Mary's High School in Kitchener leads the 2025 list of largest schools in Waterloo CDSB with Enrolment 2,240. Of the 49 schools shown, 49 are catholic.

For the full picture see the wider Ontario largest schools rankings, every school on the Waterloo CDSB page, or the comparison tool to put a shortlist side by side.

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Frequently asked questions

What is the best largest school in Waterloo CDSB?

St Mary's High School in Kitchener, Ontario ranks first among largest schools in Waterloo CDSB with Enrolment 2,240 (Enrolment: 2,240).

How are largest schools in Waterloo CDSB ranked?

Schools with the highest enrolment. Only schools eligible for the Success Index (Canada) are included; the index is shown alongside for context.

Are these 2025 rankings official?

No. They are computed by Success Tutoring from official Canadian data (Ontario – School information and student demographics; BC Data Catalogue – Foundation Skills Assessment). Provinces publish different assessments, so scores are comparable within a province, not between provinces.