Company lists · Data refreshed September 2026

Top 19 Chartered accounting firms based in Ottawa, Canada

Name: Chartered accounting firms based in Ottawa, Canada
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 29 companies tracked

RevenueBase identified 29 chartered accounting firms headquartered in Ottawa, Canada as of September 2026 and tracks 1,090 professional contacts across them, including 580 with verified work emails. Across Canada, Toronto is the largest hub for this category (165 companies); Ottawa has 29.

This list covers chartered accounting firms 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 14, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 14, 2026 86% judged on-target in blind review

29Companies

1,090Contacts tracked

580Verified emails

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The 19 largest chartered accounting firms based in Ottawa, Canada

Ranked by team size

Top 19 of 29 chartered accounting firms based in Ottawa, Canada, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to chartered accounting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Welch LLP	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	201-500	399 contacts →
	Strong evidence “Welch LLP is a Chartered Public Accounting firm that has deep roots in the communities it serves.” Source: RevenueBase Database · checked Sep 14, 2026
2	Marcil Lavallée	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	51-200	109 contacts →
	Indirect 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: RevenueBase Database · checked Sep 14, 2026
3	Ggfl LLP	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	51-200	94 contacts →
	Partial evidence “GGFL is the tax planning and accounting firm for Ottawa’s successful business people.” Source: RevenueBase Database · checked Sep 14, 2026
4	Logan Katz LLP	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	51-200	80 contacts →
	Partial 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: RevenueBase Database · checked Sep 14, 2026
5	Baker Tilly Ottawa LLP	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	51-200	80 contacts →
	Indirect evidence “At Baker Tilly Ottawa LLP, we provide expert tax, assurance, and entrepreneurial services to help your business grow and prosper.” Source: RevenueBase Database · checked Sep 14, 2026
6	Mccay Duff LLP	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	51-200	66 contacts →
	Partial evidence “McCay Duff LLP is a full-service Chartered Accountants Firm that has been serving the Ottawa area since 1946.” Source: RevenueBase Database · checked Sep 14, 2026
7	Lekadir LLP	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	51-200	47 contacts →
	Strong evidence “Lekadir LLP is a Chartered Professional Accounting firm providing a full range of accounting, assurance, tax, and advisory services.” Source: RevenueBase Database · checked Sep 14, 2026
8	Connelly & Koshy Professional Corporation	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	11-50	33 contacts →
	Strong 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: RevenueBase Database · checked Sep 14, 2026
9	Hendry Warren LLP	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	51-200	12 contacts →
	Indirect 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: RevenueBase Database · checked Sep 14, 2026
10	Armstrong Jones LLP	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	1-10	8 contacts →
	Partial 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: RevenueBase Database · checked Sep 14, 2026
11	Bouris Wilson LLP	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	11-50	7 contacts →
	Strong evidence “Bouris, Wilson LLP is one of Ottawa-Carleton’s most respected and trusted chartered accounting firms.” Source: RevenueBase Database · checked Sep 14, 2026
12	L. Zinman & Company	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	1-10	6 contacts →
	Indirect evidence “L.” Source: RevenueBase Database · checked Sep 14, 2026
13	Leslie & Macleod, Chartered Accountants Cpas	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	11-50	5 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
14	Ouseley Hanvey Clipsham Deep LLP	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	11-50	4 contacts →
	Partial evidence “OHCD is a firm of Chartered Accountants that was founded in the Ottawa area in 1984.” Source: RevenueBase Database · checked Sep 14, 2026
15	Jordash Co. Ltee	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	1-10	4 contacts →
	Indirect evidence “Jordash Co.” Source: RevenueBase Database · checked Sep 14, 2026
16	Balanced Solutions - CAS	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	1-10	3 contacts →
	Partial evidence “We specialize in partnering with small to medium sized businesses that are not yet ready for all the aspects (and cost!) of a full-time, in-house accounting team, Controller or…” Source: RevenueBase Database · checked Sep 14, 2026
17	Robert CPA Professional Corporation	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	1-10	2 contacts →
	Partial evidence “We are an independent accounting firm serving the Orléans/Ottawa region.” Source: RevenueBase Database · checked Sep 14, 2026
18	Mcintyre & Associates Chartered Accountants	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	1-10	2 contacts →
	Strong evidence “Ottawa’s leading Chartered Accountants specializing in providing accounting, audit, taxation, consulting, assisting you from start-up to succession” Source: RevenueBase Database · checked Sep 14, 2026
19	Ibma Accounting Limited	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 14, 2026	1-10	1 contacts →
	Partial evidence “ibma Accounting is your wise choice!” Source: RevenueBase Database · checked Sep 14, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: chartered accounting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names chartered accounting firms.
Partial evidence: Its own public description names part of chartered accounting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name chartered accounting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 19 of 29 chartered accounting firms based in Ottawa, Canada

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Chartered accounting firms based in Ottawa, Canada at a glance

As of Sep 14, 2026

53.2%Verified-email coverage

37.6Average contacts per company

11-50Median size (employees)

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole Canada list rather than for Ottawa, so it is reported there. Company counts and contact totals on this page are exact for Ottawa, over 29 companies.

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 chartered accounting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Ottawa, Canada whose own description of what they do matches “chartered accounting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names chartered accounting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among chartered accounting firms, 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 its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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, 580 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 September 14, 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.

Chartered accounting firms by metro in Canada

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names chartered accounting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

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

RevenueBase identified 29 chartered accounting firms headquartered in Ottawa, Canada as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Welch LLP, headquartered in Ottawa, tops this list with the largest team on record.

Which city in Canada has the most chartered accounting firms?

Toronto leads Canada with 165 headquartered companies, followed by Calgary (100) and Vancouver (86). Ottawa has 29.

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 580 verified decision-maker contacts tracked across these 29 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 14, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 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 with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.