Internal Audit Services Companies in Leeds: Firms Overview
AC
Acumon Chartered Accountants·10 min read
Leeds has quietly become one of the UK’s key hubs for professional services, so it’s no surprise that organisations across Yorkshire look here for reliable internal audit support. Whether you’re a large corporation, a public-sector body, or a growing business trying to strengthen governance, the city offers a wide range of specialist firms - from global networks to focused regional practices.
Below you’ll find a carefully assembled list of internal audit services companies based in or serving Leeds. It’s not about ranking winners or declaring a single “best” provider. Different organisations have different regulatory pressures, risk profiles, and budgets, and what works brilliantly for one may be excessive or insufficient for another. Instead, this list is meant to give you a clear starting point - a snapshot of the credible options available locally, so you can explore which firms align with your scale, sector, and expectations.
Acumon
Acumon is a UK-based firm of chartered accountants and advisors that provides internal audit as part of its risk and assurance work, including for organisations in Leeds. We support finance leaders and boards that need an independent view of controls, governance, and operational risks. Internal audit sits alongside our broader audit and advisory services, so we often work with organisations that want ongoing oversight rather than a one-off review.
Our team is made up of UK-based professionals with backgrounds across accounting, tax, technology, and compliance. Because we also work on external audits, tax matters, and business advisory, we tend to see how risks connect across different parts of an organisation, not just within finance. That wider perspective shapes how we approach internal audit assignments, whether the focus is regulatory expectations, internal processes, or technology-related risks.
Key Highlights:
UK-based firm of chartered accountants, auditors, and advisors
Provides internal audit within a broader risk and assurance offering
Experience working with companies, charities, and group subsidiaries
Team includes professionals with HMRC and regulatory backgrounds
Registered audit firm authorised by the ICAEW
Combines accounting, governance, and technology expertise
Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
Phone: 020 8567 3451
S&W
S&W provides internal audit and assurance services to organisations across the UK, including those based in Leeds and the wider Yorkshire region. They work with business leaders, finance teams, and audit committees that need independent oversight of financial reporting, systems, and internal controls. Their work goes beyond statutory requirements, focusing on how processes operate in practice and what risks may affect performance over time.
Their teams combine sector experience with structured methodologies, which allows them to look at reporting, governance, and operational processes together. Senior staff are closely involved in engagements, and communication with client teams is treated as an ongoing part of the work. This approach is often useful for organisations dealing with change, expansion, or complex reporting environments.
Key Highlights:
UK audit and assurance provider serving organisations in Leeds
Experience with statutory and non statutory assurance work
Involvement of senior leadership in audit engagements
Focus on financial reporting, controls, and risk awareness
Work with a range of business structures and sectors
BDO operates from a Leeds office that supports businesses across Yorkshire and the North East, offering audit, advisory, and risk related services. They work with organisations of different sizes, from growing companies to listed entities, many of which operate across regional and international markets. Their internal audit and assurance work sits within a wider set of services aimed at governance, compliance, and operational oversight.
The Leeds team includes specialists across tax, finance, restructuring, and digital risk, which means internal audit assignments can draw on knowledge from multiple disciplines when needed. Being part of a national and international network also allows them to support organisations with cross border activities or group structures, while maintaining a local presence in the region.
Key Highlights:
Leeds office serving Yorkshire and the North East
Part of a national and international advisory network
Works with private, public, and listed organisations
Multidisciplinary teams covering finance, tax, and risk
Address: Central Square, 29 Wellington Street, Leeds, LS1 4DL, United Kingdom
Phone: 0113 244 3839
Protiviti
Protiviti delivers internal audit consulting services to organisations in the UK, including those operating in Leeds, focusing on risk, governance, and control frameworks. They support audit committees and senior management teams that need independent assessment of how risks are identified and managed, especially in areas such as technology, compliance, and operational change.
Their work often involves outsourced or co sourced internal audit arrangements, staff augmentation, or specialist reviews. Technology plays a visible role in their approach, with attention to data, cybersecurity, and digital transformation risks. This can be relevant for organisations dealing with complex IT environments or regulatory scrutiny related to data and systems.
Key Highlights:
Global consulting firm providing internal audit services in the UK
Supports outsourced, co sourced, and advisory models
Focus on technology risk and regulatory compliance
Works with audit committees and executive teams
Experience across multiple industries
Services:
Internal audit outsourcing and co sourcing
Technology and IT audit
Controls advisory
Fraud risk management
SOX compliance support
Capital project assurance
Audit transformation consulting
Contact Information:
Website: www.protiviti.com
Facebook: www.facebook.com/Protiviti
Twitter: x.com/ProtivitiUK
LinkedIn: www.linkedin.com/company/protiviti-uk-
Instagram: www.instagram.com/protiviti.uk
Address: Northspring, 21-23 Wellington St, Leeds LS1 2HH, United Kingdom
Phone: +44.11.3242. 8978
PKF Littlejohn
PKF Littlejohn provides internal audit and controls services to organisations across the UK, with a presence in Leeds supporting local businesses and regulated sectors. They work with companies that need structured assurance over governance, risk management, and internal control systems, particularly where regulatory expectations are high or operations are complex.
Their internal audit work can involve setting up new functions, supporting existing teams, or carrying out targeted reviews of specific areas. This flexibility allows organisations to address gaps in resources or expertise without building a full in house department. They also provide guidance to boards and senior management on audit planning and best practice.
Key Highlights:
UK firm with offices including Leeds
Experience in regulated and complex industries
Supports both new and existing internal audit functions
Address: 4th Floor, 12 King Street, Leeds, Yorkshire, LS1 2HL
Phone: +44(0)113 244 5141
Grant Thornton
Grant Thornton provides risk based internal audit services to organisations across the UK, including businesses and public sector bodies in Leeds. Their teams work with boards and management to provide independent assurance on governance, controls, and risk management, especially in environments shaped by regulatory pressure or organisational change.
Internal audit support can be delivered through outsourcing, co sourcing, or temporary staff placements, depending on what the organisation needs at a given time. Their approach often combines audit professionals with subject matter experts, allowing reviews to cover areas such as emerging risks, new initiatives, or complex operational processes.
Key Highlights:
UK wide advisory firm serving organisations in Leeds
Sedulo provides internal audit services to organisations from its Leeds office, working with both local businesses and larger groups operating across regions. Their work centres on evaluating risk exposure, internal controls, and governance arrangements so that management teams have a clearer picture of potential weaknesses or compliance issues. Internal audit programmes are often structured as ongoing reviews rather than one off exercises.
They also support organisations that already have internal audit functions by assessing effectiveness or providing additional expertise. This can include targeted reviews where specific concerns have been identified, as well as training and advisory support for staff and leadership teams. Their client base ranges from smaller businesses to global organisations with multiple divisions.
Key Highlights:
Leeds based presence with national client coverage
Focus on risk management and internal control frameworks
Supports both large organisations and smaller businesses
Experience with cross border and multi division operations
Address: St. Paul’s House, 23 Park Square, Leeds, LS1 2ND
Phone: 0333 222 4445
Forvis Mazars
Forvis Mazars provides internal audit services through its UK network, including support for organisations in Leeds across both private and public sectors. Their work is aimed at helping boards and management understand how effectively risks are being managed and whether governance arrangements are operating as intended. Internal audit is positioned as an ongoing function that supports decision making as well as compliance.
Assignments often draw on specialists from different industries, which can be useful where operations involve complex regulations, technology change, or multiple business units. They also advise organisations that are establishing new internal audit functions or reviewing existing ones to ensure they remain aligned with strategic objectives and external requirements.
Key Highlights:
International firm with offices across the UK including Leeds
Sector specific expertise across many industries
Supports development or enhancement of internal audit functions
Focus on governance, risk management, and compliance
AAB provides audit and assurance services to organisations throughout the UK, including those operating in Leeds, with internal audit forming part of a broader risk focused offering. Their work involves reviewing processes, controls, and governance arrangements to help organisations identify potential issues before they escalate. This can include both ongoing internal audit programmes and targeted projects addressing specific risks.
They also support organisations through co sourced arrangements, secondments, or specialist reviews, which can be useful where in house teams need additional capacity or expertise. Alongside internal audit, they carry out related work such as fraud prevention reviews and contract audits, reflecting the wider range of risks many organisations face today.
Key Highlights:
UK audit firm serving private, public, and not for profit sectors
Risk focused internal audit approach
Supports co sourced and outsourced arrangements
Experience with complex projects and joint ventures
Address: Gresham House, 5-7 St Paul's St, Leeds, LS1 2JG
Phone: +44 (0)113 297 6789
Armstrong Watson
Armstrong Watson provides audit and assurance services to organisations across the UK, including businesses and charities in Leeds and the wider region. Their internal audit work is designed to help organisations strengthen controls, manage risks, and review whether systems and processes are working as intended. This can be particularly relevant for organisations undergoing growth, restructuring, or regulatory scrutiny.
They also carry out a range of related assurance engagements, from statutory audits to specialist reviews of grants and pension schemes. Internal audit programmes are usually tailored to the organisation’s size and objectives, with an emphasis on understanding how operational and strategic issues connect across the business.
Key Highlights:
UK audit firm serving commercial and not for profit sectors
Experience with complex and large scale audit assignments
Focus on aligning operational processes with strategic goals
Address: Third Floor, 10 South Parade, Leeds, LS1 5QS
Phone: 0113 221 1300
Conclusion
If you step back and look at the options, Leeds has more depth in internal audit services than many people expect. There are large international firms, mid sized practices, and smaller specialist teams all operating in the same city. That means organisations can usually find something that fits - whether they need a full outsourced internal audit function, a few targeted reviews, or simply extra support during a demanding period.
In reality, choosing an internal auditor is less about picking a “top firm” and more about finding people who understand your organisation and the pressures you are under. For some, local presence matters because face to face work is easier. Others care more about sector experience or access to specialist skills. The companies listed above give a solid picture of what is available around Leeds, so the next step is simply to talk to a few of them and see who feels like a practical match for the way your organisation actually operates day to day.
AC
Written by the Acumon team
Acumon is an ICAEW-registered firm of chartered accountants and registered auditors
based in London, with offices in Pitstone, Aylesbury and Bournemouth. Need advice on
anything covered here? Talk to us.
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