What are the leading consulting firms in the UK for Lean & SixSigma services? The top Lean & SixSigma consulting firms in the UK ranking presents the region’s most trusted, expert and influential consultancy firms in the domain for the year 2025.
The capabilities of consulting firms is based on the views of executives and consultants active in Lean & SixSigma, as well as on assessments of Lean & SixSigma capabilities, company reputation, analyst benchmarks, industry recognitions, thought leadership and more (see the methodology for details).
View all rankings: Top consulting firms in the UK 2025.
The top consulting firms in the UK for Lean & SixSigma services:
Over 500+ consulting firms were assessed for the Lean & SixSigma ranking in 2025, of which 46 qualify as a top player:
Diamond level
Inactive
Kearney
The company profile of Kearney on Consultancy.uk is currently not activated....
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Inactive
Accenture
Accenture does not have an active company profile on Consultancy.uk....
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Inactive
Bain & Company
Bain & Company is not a partner of Consultancy UK....
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Inactive
Bourton Group
The company profile of Bourton Group on Consultancy.uk is currently not activated....
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McKinsey & Company
McKinsey & Company is a global management consulting firm. We are the trusted advisor to the world's leading businesses, governments, and institutions. We strive for world-shaping client impact We work with leading organizations across the private, public and social se...
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Platinum level
Inactive
KPMG
KPMG is not a partner of Consultancy UK....
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EFESO Management Consultants
EFESO Management Consultants is a global consulting group specialized in operations strategy and performance improvement. We work side-by-side with our clients to accelerate their transformation towards future-proof operations. Each year, we deliver over 1,000 projects...
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Inactive
Vendigital
The Company profile of Vendigital on Consultancy.uk is currently not activated....
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Capgemini Invent
Capgemini Invent is Capgemini Group’s innovation, design, and transformation powerhouse, accelerating ideas into prototypes and scalable real-world solutions that help our clients get the future they want. Disruption is everywhere, intensifying the need for businesses ...
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dss+
With over 900 professionals in 40 countries, we are a world-class operations management consulting firm with a purpose of saving lives and creating a sustainable future. From our solid legacy as DuPont Sustainable Solutions, we have evolved and enhanced our capabilitie...
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Inactive
EY
The company profile of EY on Consultancy.uk is currently not activated....
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Inactive
Kaizen Institute
The company profile of Kaizen Institute on Consultancy.uk is currently not activated....
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Inactive
IBM Consulting
The company profile of IBM on Consultancy.uk is currently not activated....
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Inactive
Deloitte
Deloitte is not a partner of Consultancy UK....
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Inactive
PwC
PwC does not have an active profile on Consultancy.uk....
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Inactive
Newton
The company profile of Newton Europe on Consultancy.uk is currently not activated....
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Inactive
Baringa
The company profile of Baringa is not activated on Consultancy.uk....
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Develop Consulting
Develop Consulting exists for one single-minded reason – to help organisations be the best they can be. We are a team of tried and tested experts in the implementation of improvement processes for manufacturing, construction and healthcare. It all starts with getting u...
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Inactive
Proudfoot
The company profile of Proudfoot on Consultancy.uk is currently not activated....
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BearingPoint
BearingPoint is an independent management and technology consultancy with European roots and a global reach. The company operates in three business units: Consulting, Products, and Capital. Consulting covers the advisory business with a clear focus on selected business...
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Inactive
Boston Consulting Group
The company profile of Boston Consulting Group on Consultancy.uk is currently not activated....
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Gold level
Inactive
Catalyst Consulting
The company profile of Catalyst Consulting on Consultancy.uk is currently not activated....
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Inactive
Sia
The Company profile of Sia Partners on Consultancy.uk is currently not activated....
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Inactive
The Lean Six Sigma Company
The company profile of The Lean Six Sigma Company on Consultancy.uk is currently not activated....
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Inactive
Miebach Consulting
The company profile of Miebach Consulting on Consultancy.uk is currently not activated....
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Inactive
Oaklin
The Company profile of Oaklin on Consultancy.uk is currently not activated....
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Argon & Co
Argon & Co is a global management consultancy that specialises in operations strategy and transformation. With expertise spanning the supply chain, procurement, finance and shared services, we work together with clients to transform their businesses and generate real c...
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PA Consulting
We believe in the power of ingenuity to build a positive human future. As strategies, technologies, and innovation collide, we create opportunity from complexity. Our diverse teams of experts combine innovative thinking and breakthrough technologies to progress further...
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Inactive
Unipart Consultancy
The Company profile of Unipart Consultancy on Consultancy.uk is currently not activated....
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Oliver Wyman
Oliver Wyman is a global leader in management consulting. With offices in over 70 cities across 30 countries, we combine deep industry knowledge with specialized expertise in strategy, operations, risk management, and organization transformation. Our more than 7,000 pr...
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Inactive
Chartwell
Chartwell Consulting does not have an active company profile on Consultancy.uk....
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Inactive
Henkan
The profile of Henkan on Consultancy.uk is not active....
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Silver level
Curzon Consulting
We are an award-winning management consultancy who deliver tangible and enduring results for our clients. The Financial Times and Statista named Curzon Consulting as one of the UK’s Leading Management Consultants 2020, based on recommendations by peers and clients. We ...
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Inactive
Egremont Group
The company profile of Egremont Group on Consultancy.uk is currently not activated....
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Inactive
Roboyo
The company profile of Roboyo on Consultancy.uk is currently not activated....
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Oliver Wight
Oliver Wight are business improvement specialists with over 50 years of experience and a proven sustainable approach that delivers results straight to the bottom line. We help some of the world's best-known organizations to create a culture of continuous improvement an...
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Inactive
BDO
The Company profile of BDO on Consultancy.uk is currently not activated....
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Inactive
S A Partners
S A Partners does not have an active company profile on Consultancy.uk....
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Inactive
TXM
The company profile of TXM on Consultancy.uk is currently not activated....
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Inactive
TBM
The company profile of TBM on Consultancy.uk is currently not activated....
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Inactive
Lean Six Sigma Group
The company profile of Lean Six Sigma Group on Consultancy.uk is currently not activated....
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Bronze level
Inactive
Wipro
The company profile of Wipro on Consultancy.uk is currently not activated....
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Collinson Grant
Collinson Grant helps clients throughout the world to improve efficiency and profitability. Our work usually focuses on organisation, process, people and costs. We restructure complex businesses in many sectors; turn around performance at struggling operations; improve...
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Inactive
RSM
The company profile of RSM on Consultancy.uk is currently not activated....
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Inactive
EMS Cognito
The company profile of EMS Cognito on Consultancy.uk is currently not activated....
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Inactive
Visagio
Visagio is a management consultancy that offers a different approach. We carry out diagnoses, strategy design and organisational improvement, as well as providing support to implement and operationalise defined solutions through consultancy, interim management, technol...
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