Ranked · 30 of 34 assessed
Ordered by Agency List ScoreCrafts integrated media experiences for global brands
Creative campaigns for global brands and social causes
Creates brand strategies and digital experiences for global clients
Combines art, heart, and science for impactful media strategies.
Global out-of-home media with data-driven insights and creativity
Creative campaigns and digital strategies for impactful brand growth
Independent media agency specializing in data-driven success and client partnerships.
Purpose-led creativity for transformative business impact
Connecting brands with diverse audiences through multicultural marketing and media planning.
Media and PPC services for inbound lead capture and search visibility
Integrating brands into cultural conversations and experiences
Digital advertising across search and social channels
Integrated media campaigns across traditional and digital channels
Creating entertainment-driven campaigns for high engagement and conversion
Creative campaigns for brands like John Lewis and EE
Creates iconic brands using difference and creativity
Creative campaigns and media production for brand fame and sales effectiveness.
Independent media planning and buying since 1975
Technical SEO, ecommerce audits, and WordPress builds across 12 languages
Integrated creative strategies for TV, digital, and brand growth
In-flight advertising solutions for over 140 airlines worldwide
Disruptive advertising for real-world change and social impact
Creative campaigns and brand strategy for impatient brands
Specializes in audio advertising and immersive content production
Provocative advertising and culturally influential campaigns
Independent creative company with a global presence and diverse projects
Populist creativity driving growth through strategic advertising
Specializing in Digital Out of Home Creative Production
Creative strategies loved by real people across the UK
Also in Greater London · 7 not ranked here
3 have not yet been assessed on the Agency List Score. Alphabetical.About this ranking
What this page ranks
This page ranks 30 of the 34 assessed advertising agencies in Greater London, United Kingdom — the ones carrying a published score — out of 35 listed.
The score measures how well an agency documents its own work in public — named clients, quantified outcomes, and whether those outcomes are attributed to the agency rather than described as the client's own results. It does not measure client satisfaction, price, or availability.
Cohorts and awards
Agencies are compared within a cohort — here, Advertising in Greater London, United Kingdom. A cohort must be large enough to express the band being awarded: at least 8 assessed agencies for a top 25% award, 20 for top 10%, 40 for top 5%, and 300 for top 1%. This one holds 34, so the strongest award available here is top 10%.
The 3 advertising agencies not yet assessed are listed on this page but not ranked.
A further 4 were assessed and no published evidence of their work was found, so no score is shown for them.
Paid placement
Partner agencies can buy a labelled placement block above the ranking on this page. It is always marked as paid and is never mixed into the ranked list.
Placement is paid; it does not affect the ranking, cohort membership, or any agency's score. Ranking position, cohort membership and the score itself are not for sale.
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Questions
- How many advertising agencies are in Greater London, United Kingdom?
- 35 are listed on Agency List in Greater London, United Kingdom. 34 of them have been assessed on the Agency List Score as of October 2026, and 30 of those carry a published score.
- Which advertising agency in Greater London, United Kingdom is ranked highest?
- Dentsu X, with an Agency List Score of 96.9, ranks #1 of 34 assessed agencies in Advertising in Greater London, United Kingdom.
- Why are 7 advertising agencies listed here but not ranked?
- 3 of the 35 listed have not yet been assessed on the Agency List Score. A further 4 were assessed and no published evidence of their work was found, so no score is shown for them. They each have a profile and are listed below the ranking, alphabetically, rather than being hidden or mixed into it.
- How is the ranking determined?
- By Agency List Score, within the Advertising in Greater London, United Kingdom cohort of 34 assessed agencies. The score is computed from evidence published on each agency's own website: named clients, quantified outcomes, and whether the outcome is attributed to the agency. Paid placement does not affect it.