Company lists · Data refreshed September 2026

Top 25 Advocacy organizations consulting firms based in Ottawa, Canada

Name: Advocacy organizations consulting firms based in Ottawa, Canada
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 113 companies tracked

RevenueBase identified 113 advocacy organizations consulting firms headquartered in Ottawa, Canada as of September 2026 and tracks 944 professional contacts across them, including 449 with verified work emails. Across Canada, Toronto is the largest hub for this category (272 companies); Ottawa follows with 113.

This list covers advocacy organizations consulting 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 27, 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 27, 2026 86% judged on-target in blind review

113Companies

944Contacts tracked

449Verified emails

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The 25 largest advocacy organizations consulting firms based in Ottawa, Canada

Ranked by team size

Top 25 of 113 advocacy organizations consulting firms based in Ottawa, Canada, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to advocacy organizations consulting 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	Earnscliffe Strategies	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	51-200	84 contacts →
	Indirect evidence “Founded in 1989 and independently owned by our principals, Earnscliffe operates from offices in Ottawa-Gatineau, Toronto and Vancouver.” Source: RevenueBase Database · checked Sep 27, 2026
2	PAA Advisory Conseils	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	67 contacts →
	Indirect evidence “PAA is a national public affairs and strategic communications firm.” Source: RevenueBase Database · checked Sep 27, 2026
3	Spark Advocacy	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	41 contacts →
	Indirect evidence “To open minds, you need a clear thought.” Source: RevenueBase Database · checked Sep 27, 2026
4	Tactix Government Relations And Public Affairs	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	36 contacts →
	Indirect evidence “For over 25 years TACTIX has been a trusted advisor to leading Canadian and Fortune 500 companies, offering unparalleled experience in solving complex government relations threats…” Source: RevenueBase Database · checked Sep 27, 2026
5	Mcmillan Vantage	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	34 contacts →
	Indirect evidence “When you have a pressing challenge, McMillan Vantage has the senior expertise with a deep understanding of what you need to know, when you need it most.” Source: RevenueBase Database · checked Sep 27, 2026
6	Compass Rose	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	30 contacts →
	Indirect evidence “Compass Rose is a public affairs firm where helping companies and organizations find the common good is at the core of who we are and what we do.” Source: RevenueBase Database · checked Sep 27, 2026
7	Sandstone Group	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	1-10	24 contacts →
	Indirect evidence “Sandstone Group Sandstone Group, based in Ottawa, specializes in providing strategic advice to corporate executives in matters of public affairs, government relations, crisis…” Source: RevenueBase Database · checked Sep 27, 2026
8	Conway Baxter Wilson LLP S.R.L	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	22 contacts →
	Indirect evidence “Founded in 2014, Conway is a boutique litigation firm located in Ottawa.” Source: RevenueBase Database · checked Sep 27, 2026
9	Canadian Leaders In International Consulting Clic	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	22 contacts →
	Indirect evidence “Complex development environments demand more than technical expertise, they require partners who understand the terrain.” Source: RevenueBase Database · checked Sep 27, 2026
10	49 Solutions	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	19 contacts →
	Partial evidence “At 49 Solutions we consistently deliver top quality consulting services, supporting both business and technology.” Source: RevenueBase Database · checked Sep 27, 2026
11	Bluesky Strategy Group INC	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	18 contacts →
	Indirect evidence “Bluesky Strategy Group delivers public affairs, strategic communications, government relations, and media relations advice and execution.” Source: RevenueBase Database · checked Sep 27, 2026
12	STIFF	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	18 contacts →
	Indirect evidence “Stiff is a strategic communications agency.” Source: RevenueBase Database · checked Sep 27, 2026
13	Maple Leaf Strategies	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	16 contacts →
	Indirect evidence “EXPERT Government Relations.” Source: RevenueBase Database · checked Sep 27, 2026
14	Blackbird Strategies	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	12 contacts →
	Indirect evidence “Blackbird Strategies is a full-service, values-driven public affairs firm specializing in working with First Nations, businesses, associations, Indigenous communities, and others…” Source: RevenueBase Database · checked Sep 27, 2026
15	Prospectus Associates	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	1-10	12 contacts →
	Partial evidence “Prospectus Associates is one of Canada’s leading national public affairs consulting firms that prides itself on delivering high-end personalized service by experienced…” Source: RevenueBase Database · checked Sep 27, 2026
16	3sixty Public Affairs	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	11 contacts →
	Partial evidence “3Sixty Public Affairs, with consultants in Western Canada, Ontario and Québec, is Canada's leader in health sector-focused policy, public affairs and advocacy.” Source: RevenueBase Database · checked Sep 27, 2026
17	PGF Consultants	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	11 contacts →
	Indirect evidence “PGF Consultants helps organizations reach their full potential and serve their clienteles using structured and participatory processes.” Source: RevenueBase Database · checked Sep 27, 2026
18	Arctech Accelerate	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	11 contacts →
	Partial evidence “Headquartered in our nation’s capital, Arctech Accelerate is a Canadian management consulting and lobbying firm specializing in helping small and mid-sized businesses navigate…” Source: RevenueBase Database · checked Sep 27, 2026
19	First Lake Solutions	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	1-10	10 contacts →
	Indirect evidence “First Lake Solutions provides associations, municipalities and corporations with effective government relations and media relations support.” Source: RevenueBase Database · checked Sep 27, 2026
20	TDV Global INC	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	10 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026
21	The Halifax Group	Partial evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	10 contacts →
	Partial evidence “The Halifax Group is a multi-service consulting company.” Source: RevenueBase Database · checked Sep 27, 2026
22	Northstar Public Affairs	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	1-10	9 contacts →
	Indirect evidence “NorthStar Public Affairs is a boutique public affairs agency which services those in need of smart, effective strategies and support for navigating Canadian politics and…” Source: RevenueBase Database · checked Sep 27, 2026
23	David Pratt & Associates	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	11-50	8 contacts →
	Indirect evidence “David Pratt & Associates (DP & A), is a government relations and strategic consultancy firm located in Ottawa, Canada.” Source: RevenueBase Database · checked Sep 27, 2026
24	Niva INC	Indirect evidence	Ottawa, CanadaHQ checked Sep 27, 2026	11-50	7 contacts →
	Indirect evidence “NIVA helps organizations and companies to engage their audience and tell their story so they can mobilize knowledge, solve problems, influence outcomes, and win markets.” Source: RevenueBase Database · checked Sep 27, 2026
25	ONE Persuasion	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 27, 2026	1-10	7 contacts →
	Indirect evidence “ONE is a high-stakes, national, public strategy firm.” Source: RevenueBase Database · checked Sep 27, 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: advocacy organizations consulting 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 advocacy organizations consulting firms.
Partial evidence: Its own public description names part of advocacy organizations consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name advocacy organizations consulting 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 25 of 113 advocacy organizations consulting firms based in Ottawa, Canada

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Advocacy organizations consulting firms based in Ottawa, Canada at a glance

As of Sep 27, 2026

47.6%Verified-email coverage

8.4Average contacts per company

1-10Median size (employees)

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 113 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 advocacy organizations consulting 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 “advocacy organizations consulting 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 advocacy organizations consulting 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 advocacy organizations consulting 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, 449 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 27, 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.

Advocacy organizations consulting 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 advocacy organizations consulting 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 advocacy organizations consulting firms are there based in Ottawa, Canada?

RevenueBase identified 113 advocacy organizations consulting 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?

Earnscliffe Strategies, headquartered in Ottawa, tops this list with the largest team on record.

Which city in Canada has the most advocacy organizations consulting firms?

Toronto leads Canada with 272 headquartered companies, followed by Ottawa (113) and Vancouver (113).

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 449 verified decision-maker contacts tracked across these 113 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 27, 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.