Company lists · Data refreshed August 2026

Top 25 Accounting firms serving charities based in Ottawa, Canada

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

Compiled by the RevenueBase Data Team Data refreshed Aug 30, 2026 58 companies tracked

There are 58 accounting firms serving charities headquartered in Ottawa, Canada (RevenueBase, August 2026). RevenueBase tracks 1,062 professional contacts across them, including 362 with verified work emails and 55 with mobile numbers. Toronto is the largest hub.

This list covers accounting firms serving charities headquartered in Ottawa, Canada, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed August 30, 2026.

58Companies

1,062Contacts tracked

362Verified emails

55Mobile numbers

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The 25 largest accounting firms serving charities based in Ottawa, Canada

Ranked by team size

Top 25 of 58 accounting firms serving charities based in Ottawa, Canada, ranked by team size, largest first. Data refreshed Aug 30, 2026. Evidence rates how directly each company's own description names accounting firms serving charities: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts	Verified emails
1	Marcil LavalléeIndirect evidence “Marcil Lavallée est un partenaire engagé qui contribue activement à la réussite de ses clients en anticipant leurs besoins et en leur offrant une gamme complète de solutions…” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	51-200	108	60
2	Ggfl LLPPartial evidence “GGFL is the tax planning and accounting firm for Ottawa’s successful business people.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	51-200	93	42
3	Baker Tilly Ottawa LLPPartial evidence “At Baker Tilly Ottawa LLP, we provide expert tax, assurance, and entrepreneurial services to help your business grow and prosper.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	51-200	81	48
4	Logan Katz LLPStrong evidence “Logan Katz is a forward-thinking public accounting firm delivering high-quality, client inspired accounting, taxation, assurance and business advisory services in Ottawa and…” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	51-200	80	57
5	Mccay Duff LLPPartial evidence “McCay Duff LLP is a full-service Chartered Accountants Firm that has been serving the Ottawa area since 1946.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	51-200	66	39
6	Lekadir LLPStrong evidence “Lekadir LLP is a Chartered Professional Accounting firm providing a full range of accounting, assurance, tax, and advisory services.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	51-200	46	40
7	Connelly & Koshy Professional CorporationPartial evidence “Chartered Professional Accountants licensed to practice in Ontario and Quebec with offices in Ottawa and Shawville Practice areas- Accounting - Auditing of profit oriented…” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	11-50	33	10
8	AI TAX ConsultantsStrong evidence “AI Tax Consultants specializes in delivering tax and accounting services to individuals, self-employed and corporations.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	11-50	13	2
9	Hendry Warren LLPPartial evidence “At Hendry Warren LLP our mission is to provide relevant, reliable information and advice to help our clients achieve their business goals, and offer superior client service in a…” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	51-200	12	11
10	Vaive And Associates Professional CorporationPartial evidence “Vaive and Associates Professional Corporation is a tax consulting, business advisory and accounting firm.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	11-50	8	8
11	Armstrong Jones LLPStrong evidence “Armstrong Jones LLP is an accounting firm based in Ottawa, Ontario that offers services in accounting, audit and assurance, tax planning and compliance, and a wide array of…” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	1-10	8	7
12	Bouris Wilson LLPPartial evidence “Bouris, Wilson LLP is one of Ottawa-Carleton’s most respected and trusted chartered accounting firms.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	11-50	7	6
13	L. Zinman & CompanyIndirect evidence “L.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	1-10	6	5
14	Frouin Group Professional CorporationIndirect evidence “Enterprise and Individuals We understand that your business is always evolving.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	11-50	6	4
15	ZIVOPartial evidence “Zivo is a nonprofit-focused accounting and virtual CFO firm that works as an extension of leadership teams and boards.” Source: company website · checked Aug 30, 2026	Ottawa, Canada	1-10	6	1
16	Leslie & Macleod, Chartered Accountants CpasIndirect evidence Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	11-50	5	4
17	Ouseley Hanvey Clipsham Deep LLPIndirect evidence “OHCD is a firm of Chartered Accountants that was founded in the Ottawa area in 1984.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	11-50	4	3
18	Jordash Co. LteeIndirect evidence “Jordash Co.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	1-10	4	2
19	Accountrain INCIndirect evidence Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	1-10	4	2
20	Elevate By Welch LLPPartial evidence “Elevate by Welch LLP is designed as a one-stop shop for all your accounting needs.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	201-500	4	1
21	Deltax Accounting & TAX Services INCStrong evidence “Premier Provider of Bookkeeping and Accounting Services” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	1-10	4	1
22	Meritum ServicesIndirect evidence “Comptabilité pour entreprises et particuliers.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	1-10	3	1
23	Robert CPA Professional CorporationStrong evidence “We are an independent accounting firm serving the Orléans/Ottawa region.” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	1-10	2	2
24	Mcintyre & Associates Chartered AccountantsPartial evidence “Ottawa’s leading Chartered Accountants specializing in providing accounting, audit, taxation, consulting, assisting you from start-up to succession” Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	1-10	2	2
25	Dayani Castro Group CorpIndirect evidence Source: company website · checked Aug 30, 2026	Ottawa, ON, Canada	1-10	2	1

Showing 25 of 58 accounting firms serving charities based in Ottawa, Canada

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Accounting firms serving charities based in Ottawa, Canada at a glance

As of Aug 30, 2026

1-10Median size (employees)

TorontoLargest hub · 237 HQs

55Contacts with mobile numbers

Aug 30, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Accounting firms serving charities by metro in Canada

Metro	Companies
Accounting firms serving charities in Toronto	237
Accounting firms serving charities in Calgary	159
Accounting firms serving charities in Mississauga	152
Accounting firms serving charities in Montreal	141
Accounting firms serving charities in Vancouver	128
Accounting firms serving charities in Edmonton	96
Accounting firms serving charities in Ottawa	58
Accounting firms serving charities in Surrey	54

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among accounting firms serving charities, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
What qualifies: Companies headquartered in Ottawa, Canada whose own description of what they do matches “accounting firms serving charities”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among accounting firms serving charities, and records with no verified work email. Companies headquartered outside Ottawa are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself.
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: Every listed company carries at least one verified work email, 362 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on August 30, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

How many accounting firms serving charities are there based in Ottawa, Canada?

There are 58 accounting firms serving charities 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 serving charities?

Toronto leads with 237 headquartered companies, followed by Calgary (159) and Mississauga (152).

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 362 verified decision-maker contacts tracked across these 58 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 30, 2026.

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Accounting firms serving charities by geography

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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.