Largest Schools in London District Catholic School Board (2025)

Schools with the highest enrolment. Ranked by the Success Index (Canada) from official Canadian data; 53 schools in London District Catholic School Board, Ontario. Rank positions shown on each profile are within Canada and Ontario.

#	School	Sector	Enrolment	Success Index (Canada)	Key result	Students
1	Mother Teresa Catholic Secondary School London · Secondary · Grades 9-12	Catholic	1,795	55.7 Top 50%	90% OSSLT pass rate	1,795
2	St. Andre Bessette Secondary School London · Secondary · Grades 9-12	Catholic	1,465	63.4 Top 50%	90% OSSLT pass rate	1,465
3	St Thomas Aquinas Secondary School London · Secondary · Grades 9-12	Catholic	1,425	75.5 Top 25%	94% OSSLT pass rate	1,425
4	Catholic Central High School London · Secondary · Grades 9-12	Catholic	1,310	45.9 Lower 50%	89% OSSLT pass rate	1,310
5	St Joseph's High School St. Thomas · Secondary · Grades 9-12	Catholic	960	56.6 Top 50%	92% OSSLT pass rate	960
6	John Paul II Catholic Secondary School London · Secondary · Grades 9-12	Catholic	940	17.4 Lower 50%	71% OSSLT pass rate	940
7	Regina Mundi College London · Secondary · Grades 9-12	Catholic	860	16.2 Lower 50%	74% OSSLT pass rate	860
8	St. Anne's Separate School St. Thomas · Elementary · Grades JK-8	Catholic	800	40.1 Lower 50%	69.3% EQAO Grade 6	800
9	Sir Arthur Carty Separate School London · Elementary · Grades JK-8	Catholic	620	41.2 Lower 50%	74.3% EQAO Grade 6	620
10	St Mary's High School Woodstock · Secondary · Grades 9-12	Catholic	605	42.1 Lower 50%	82% OSSLT pass rate	605
11	St. Rose of Lima Separate School London · Elementary · Grades JK-8	Catholic	600	61.5 Top 50%	81% EQAO Grade 6	600
12	St Michael's School Woodstock · Elementary · Grades JK-8	Catholic	590	49.1 Lower 50%	76.7% EQAO Grade 6	590
13	Our Lady of Lourdes Separate School Delaware · Elementary · Grades JK-8	Catholic	570	86.2 Top 5%	90.3% EQAO Grade 6	570
14	St. Nicholas Senior Separate School London · Elementary · Grades JK-8	Catholic	545	74.0 Top 25%	86% EQAO Grade 6	545
15	St Francis School London · Elementary · Grades JK-8	Catholic	545	28.3 Lower 50%	62.3% EQAO Grade 6	545
16	St. John French Immersion School London · Elementary · Grades JK-8	Catholic	540	66.5 Top 50%	83% EQAO Grade 6	540
17	Blessed Sacrament Separate School London · Elementary · Grades JK-8	Catholic	535	39.4 Lower 50%	77% EQAO Grade 6	535
18	St Anne's Separate School London · Elementary · Grades JK-8	Catholic	530	22.5 Lower 50%	63.3% EQAO Grade 6	530
19	Monsignor Morrison Separate School St Thomas · Elementary · Grades JK-8	Catholic	525	41.7 Lower 50%	62.3% EQAO Grade 6	525
20	St Marguerite d'Youville School London · Elementary · Grades JK-8	Catholic	485	42.3 Lower 50%	64.3% EQAO Grade 6	485
21	St Pius X Separate School London · Elementary · Grades JK-8	Catholic	485	19.2 Lower 50%	54.7% EQAO Grade 6	485
22	St Catherine of Siena Elementary School London · Elementary · Grades JK-8	Catholic	480	70.1 Top 25%	79.3% EQAO Grade 6	480
23	St. Gabriel Catholic Elementary School Catholic Elementary School London · Elementary · Grades JK-8	Catholic	480	69.8 Top 25%	82.3% EQAO Grade 6	480
24	St Patrick's School Woodstock · Elementary · Grades JK-8	Catholic	465	43.9 Lower 50%	65.7% EQAO Grade 6	465
25	St Anthony Catholic French Immersion School London · Elementary · Grades JK-8	Catholic	460	55.7 Top 50%	80.3% EQAO Grade 6	460
26	St Martin Separate School London · Elementary · Grades JK-8	Catholic	455	47.5 Lower 50%	72.7% EQAO Grade 6	455
27	Holy Cross Catholic Secondary School Strathroy · Secondary · Grades 9-12	Catholic	425	52.7 Top 50%	85% OSSLT pass rate	425
28	St Mark Separate School London · Elementary · Grades JK-8	Catholic	425	52.7 Top 50%	72% EQAO Grade 6	425
29	St Michael Separate School London · Elementary · Grades JK-8	Catholic	425	44.2 Lower 50%	82.3% EQAO Grade 6	425
30	St Theresa Separate School London · Elementary · Grades JK-8	Catholic	410	79.1 Top 10%	77.7% EQAO Grade 6	410
31	St Paul Separate School London · Elementary · Grades JK-8	Catholic	405	60.7 Top 50%	87% EQAO Grade 6	405
32	St Jude Separate School London · Elementary · Grades JK-8	Catholic	390	42.4 Lower 50%	79.3% EQAO Grade 6	390
33	St Jude's School Ingersoll · Elementary · Grades JK-8	Catholic	390	36.7 Lower 50%	69.3% EQAO Grade 6	390
34	St Thomas More Separate School London · Elementary · Grades JK-8	Catholic	375	18.8 Lower 50%	69.3% EQAO Grade 6	375
35	St. Kateri Separate School London · Elementary · Grades JK-8	Catholic	370	72.1 Top 25%	80.3% EQAO Grade 6	370
36	St Sebastian Separate School London · Elementary · Grades JK-8	Catholic	360	25.1 Lower 50%	68.3% EQAO Grade 6	360
37	Notre Dame Separate School London · Elementary · Grades JK-8	Catholic	355	59.2 Top 50%	94.7% EQAO Grade 6	355
38	Our Lady Immaculate School Strathroy · Elementary · Grades JK-8	Catholic	335	49.1 Lower 50%	82.3% EQAO Grade 6	335
39	St Joseph's School Tillsonburg · Elementary · Grades JK-4	Catholic	330	39.9 Lower 50%	69.7% EQAO Grade 3	330
40	St Bernadette Separate School London · Elementary · Grades JK-8	Catholic	330	21.0 Lower 50%	52.3% EQAO Grade 6	330
41	St Patrick Separate School Lucan · Elementary · Grades JK-8	Catholic	325	54.5 Top 50%	60.7% EQAO Grade 6	325
42	St George Separate School London · Elementary · Grades JK-8	Catholic	280	90.2 Top 5%	93.7% EQAO Grade 6	280
43	St David Separate School Dorchester · Elementary · Grades JK-8	Catholic	270	52.1 Top 50%	68.7% EQAO Grade 6	270
44	Holy Rosary Separate School London · Elementary · Grades JK-8	Catholic	265	21.3 Lower 50%	63% EQAO Grade 6	265
45	Holy Family Elementary School London · Elementary · Grades JK-8	Catholic	255	36.0 Lower 50%	62.7% EQAO Grade 6	255
46	Holy Family School Woodstock · Elementary · Grades JK-8	Catholic	240	65.8 Top 50%	76% EQAO Grade 6	240
47	St Mary's Separate School West Lorne · Elementary · Grades JK-8	Catholic	235	42.1 Lower 50%	48.3% EQAO Grade 6	235
48	St Mary School London · Elementary · Grades 5-8	Catholic	230	69.9 Top 25%	93% EQAO Grade 6	230
49	St Vincent de Paul Separate School Strathroy · Elementary · Grades JK-8	Catholic	225	30.6 Lower 50%	56.3% EQAO Grade 6	225
50	Monsignor J H O'Neil School Tillsonburg · Elementary · Grades 5-8	Catholic	210	31.2 Lower 50%	69.7% EQAO Grade 6	210
51	Assumption Separate School Aylmer · Elementary · Grades JK-8	Catholic	195	51.0 Top 50%	73.3% EQAO Grade 6	195
52	Sacred Heart Separate School Parkhill · Elementary · Grades JK-8	Catholic	110	63.0 Top 50%	73% EQAO Grade 6	110
53	St Charles Separate School Glencoe · Elementary · Grades JK-8	Catholic	100	41.8 Lower 50%	59.3% EQAO Grade 6	100

Mother Teresa Catholic Secondary School in London leads the 2025 list of largest schools in London District Catholic School Board with Enrolment 1,795. Of the 53 schools shown, 53 are catholic.

For the full picture see the wider Ontario largest schools rankings, every school on the London District Catholic School Board 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 London District Catholic School Board?

Mother Teresa Catholic Secondary School in London, Ontario ranks first among largest schools in London District Catholic School Board with Enrolment 1,795 (Enrolment: 1,795).

How are largest schools in London District Catholic School Board 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.