Find the best SEO agencies in London. Compare top-rated SEO companies and choose the right partner for your business.
London, United Kingdom
Operating out of London and serving clients in more than 40 countries, Megrisoft Limited UK is a digital marketing and web development agency with a…
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London, United Kingdom
Based in London, this agency has worked with enterprise-scale organic growth accounts since 2014, including furniture and homeware retailers, travel…
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Based at 124 City Road in London, Mepia is a small digital marketing agency operating from a single UK office and serving businesses looking to grow…
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London, United Kingdom
Based in London, Mercātus works with consumer brands selling on Amazon and other global marketplaces, supporting both Vendor and Seller accounts. The…
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London, United Kingdom
Based in Southwark, London, at Bankside 3, MG OMD works with some of the UK's largest brands as a media communications agency and part of Omnicom Med…
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London, United Kingdom
Based in London, Micmine is a small digital marketing agency serving businesses that need help with online visibility, e-commerce sales, and website…
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London, United Kingdom
Milktree operates from London as a design subscription service aimed at UK marketing teams that need ongoing creative output without hiring in-house…
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London, United Kingdom
Millenio is a London-based agency specialising in link building, offering a marketplace of vetted domains alongside a managed service and outreach so…
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London, United Kingdom
Founded in 2007 and based in London, Mintense is a small digital marketing agency, with offices also referenced in the US and other parts of Europe,…
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London, United Kingdom
Based in London, MMT Digital operates as part of MSQ DX, a digital arm of the wider MSQ group that positions itself as a specialist in translating di…
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London, United Kingdom
MN2S is based in London and operates as a global talent agency working across music, sports and entertainment, with a small team serving brands, reco…
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London, United Kingdom
Mobiteam has run web projects since 2012 from a base at Finsbury Park in London, with additional offices in Berlin and Chișinau that give the team ac…
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Molecule is a London-based digital marketing agency specialized in delivering innovative and data-driven solutions that empower brands to thrive in t…
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Molo Agency is a small digital studio based in Cockfosters, London, working with businesses across the UK, Europe and the US. Founded in 2021, the te…
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London, United Kingdom
With offices in London, Bournemouth and Edinburgh, Molzana combines data and analytics work with search engine optimisation and conversion optimisati…
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London, United Kingdom
Based in Stratford, this small digital marketing team works with local and East London businesses looking to grow their online presence and customer…
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London, United Kingdom
Based in London, Monumental Marketing works with consumer brands seeking marketing leadership alongside hands-on execution, positioning itself as a g…
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London, United Kingdom
Based in London, Moore-Wilson works across a range of sectors including aerospace and aviation, engineering and manufacturing, finance and investment…
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London, United Kingdom
Based in Waterloo, London, Moreish Marketing works specifically with brands in the financial services space, focusing on companies that touch people'…
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London, United Kingdom
London-based MotionTrust Digital works with local businesses, ecommerce sellers and Amazon merchants, alongside SEO agencies and marketers seeking wh…
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The complete migration playbook: what to freeze before launch, how to build a redirect map that actually holds, what to test on the staging site, and how to read the first eight weeks after go-live.
2026-08-02 · 12 min read
How B2B search really works: bottom-of-funnel pages before blog volume, comparison and alternatives content, product-led assets, and attribution that survives a six-month cycle.
2026-08-02 · 11 min read
When template-generated pages work, when they get ignored, and how to build a programmatic set that survives quality updates: real data, real demand, real internal linking.
2026-08-02 · 11 min read
726 agencies are listed in London, 19% of the 3,907 recorded in United Kingdom — the country's largest city by agency count. 659 publish a direct contact.
In London: SEO (97%), SEA/PPC (54%), Social Media (51%), Web Design (50%), Content Marketing (48%). An agency that ticks every box is rarely good at all of them: look at what it puts first.
Proximity genuinely matters in two cases: local SEO — Google Business profile, reviews, "near me" queries — and needing to meet in person. For an e-commerce or SaaS site targeting the whole country, an agency in London holds no structural advantage over one elsewhere in United Kingdom. The useful criterion stays experience with your type of site.
| Team size | London | Typically |
|---|---|---|
| 1-10 | 526 (72%) | Solo consultant or small studio. Direct access, limited capacity. |
| 11-50 | 108 (15%) | Separate roles: technical, content, link building. |
| 51-200 | 3 (0%) | Structured accounts, process, formal reporting. |
| 200+ | 8 (1%) | International group, enterprise accounts. |
The 726 agencies on this page are ordered by how complete their listing is, never by payment: no position is for sale here. The information is collected from each agency's own website, checked as live. An agency can claim its listing to correct it, complete it, or connect its Search Console data.
What does SEO cost in London? Stated engagement floors here start at $1,000+. That figure says what size of engagement the agency takes on, not what yours will cost: the quote depends on the state of the site, the competition and the volume of content to produce.
Small local agency or large firm? 72% of agencies in London have fewer than ten people. At that size you talk directly to whoever does the work — the main advantage, and the main limit the day the engagement grows.
How do you check an agency before signing? Ask for a measured case on a site comparable to yours, with before and after figures. Check who will actually do the work. And get it in writing what stays yours when the contract ends: content, access, accounts.
All agencies in United Kingdom · Agencies by country · SEO guides
