Company lists · Data verified August 2026

Top 16 Accounting firms for international nonprofits based in Ottawa, Canada

Name: Accounting firms for international nonprofits based in Ottawa, Canada
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 29 companies tracked

There are 29 accounting firms for international nonprofits headquartered in Ottawa, Canada (RevenueBase, August 2026). RevenueBase tracks 788 professional contacts across them, including 260 with verified work emails and 37 with mobile numbers. Toronto is the largest hub.

This list covers accounting firms for international nonprofits headquartered in Ottawa, Canada, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

29Companies

788Contacts tracked

260Verified emails

37Mobile numbers

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The 16 largest accounting firms for international nonprofits based in Ottawa, Canada

Ranked by team size

Top 16 of 29 accounting firms for international nonprofits based in Ottawa, Canada, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Marcil Lavallée	Ottawa, ON	51-200	108	60
2	Ggfl LLP	Ottawa, ON	51-200	93	42
3	Baker Tilly Ottawa LLP	Ottawa, ON	51-200	81	48
4	Logan Katz LLP	Ottawa, ON	51-200	80	57
5	Connelly & Koshy Professional Corporation	Ottawa, ON	11-50	33	10
6	AI TAX Consultants	Ottawa, ON	11-50	13	2
7	Hendry Warren LLP	Ottawa, ON	51-200	12	11
8	Vaive And Associates Professional Corporation	Ottawa, ON	11-50	8	8
9	Armstrong Jones LLP	Ottawa, ON	1-10	8	7
10	Frouin Group Professional Corporation	Ottawa, ON	11-50	6	4
11	ZIVO	Ottawa	1-10	6	1
12	Leslie & Macleod, Chartered Accountants Cpas	Ottawa, ON	11-50	5	4
13	Jordash Co. Ltee	Ottawa, ON	1-10	4	2
14	Deltax Accounting & TAX Services INC	Ottawa, ON	1-10	4	1
15	Meritum Services	Ottawa, ON	1-10	3	1
16	Robert CPA Professional Corporation	Ottawa, ON	1-10	2	2

Showing 16 of 29 accounting firms for international nonprofits based in Ottawa, Canada

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Accounting firms for international nonprofits based in Ottawa, Canada at a glance

As of Aug 28, 2026

1-10Median size (employees)

TorontoLargest hub · 99 HQs

37Contacts with mobile numbers

4Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

Accounting firms for international nonprofits by metro in Canada

Metro	Companies
Accounting firms for international nonprofits in Toronto	99
Accounting firms for international nonprofits in Mississauga	67
Accounting firms for international nonprofits in Montreal	63
Accounting firms for international nonprofits in Vancouver	58
Accounting firms for international nonprofits in Calgary	53
Accounting firms for international nonprofits in Ottawa	29
Accounting firms for international nonprofits in Edmonton	28
Accounting firms for international nonprofits in Laval	25

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “accounting firms for international nonprofits”, with match quality audited by blind human judging, and headquartered in Ottawa, Canada.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Contact records re-verify on a rolling cadence; 4 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many accounting firms for international nonprofits are there based in Ottawa, Canada?

There are 29 accounting firms for international nonprofits headquartered in Ottawa, Canada as of August 2026 (RevenueBase).

What is the largest company on this list?

Marcil Lavallée, headquartered in Ottawa, tops this list with the largest team on record.

Which city has the most accounting firms for international nonprofits?

Toronto leads with 99 headquartered companies, followed by Mississauga (67) and Montreal (63).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 260 verified decision-maker contacts tracked across these 29 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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Related lists

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph, the same data that powers RevenueBase's B2B data products and the free research portal.