London, the heart of the United Kingdom, is home to a vibrant and thriving IT consulting landscape. Numerous globally recognized firms have established their presence in the city, catering to the diverse needs of businesses and organizations across industries. Here are the five largest IT consulting firms in London, known for their expertise, innovation, and commitment to delivering exceptional solutions:
- Accenture:
- Accenture, a global management consulting, technology services, and outsourcing company, has a significant presence in London.
- The firm offers a wide range of services, including business and technology consulting, systems integration, application development, and infrastructure management.
- Accenture is known for its client-centric approach, industry-specific expertise, and commitment to helping businesses achieve their strategic goals.
- Deloitte Consulting:
- Deloitte Consulting, part of the Deloitte Touche Tohmatsu Limited network, is one of the leading IT consulting firms in London.
- The firm provides a comprehensive range of services, including strategy consulting, digital transformation, technology implementation, and risk management.
- Deloitte Consulting is recognized for its deep industry knowledge, innovative solutions, and commitment to delivering tangible business outcomes.
- KPMG Consulting:
- KPMG Consulting, the consulting arm of KPMG International, has a strong presence in London.
- The firm offers consulting services across industries, focusing on areas such as digital transformation, business process optimization, cybersecurity, and risk management.
- KPMG Consulting is known for its collaborative approach, technical expertise, and commitment to helping clients navigate complex business challenges.
- IBM Consulting:
- IBM Consulting, a subsidiary of IBM Corporation, has a significant presence in London.
- The firm provides a wide range of consulting services, including technology consulting, digital transformation, cloud computing, and analytics.
- IBM Consulting is recognized for its industry leadership, innovative solutions, and commitment to helping clients achieve their business objectives.
- PWC Consulting:
- PWC Consulting, part of PricewaterhouseCoopers (PWC), has a strong presence in London.
- The firm offers a comprehensive suite of consulting services, including strategy consulting, technology consulting, risk management, and financial advisory.
- PWC Consulting is known for its client-centric approach, industry expertise, and commitment to delivering sustainable business solutions.
These IT consulting firms play a vital role in shaping London’s technology landscape and driving innovation across various industries. Their deep expertise, extensive resources, and commitment to client success make them invaluable partners for businesses seeking to transform their operations, embrace digital technologies, and achieve their strategic goals.

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The 7 Biggest IT Consulting Firm near London
Stronghold I.T.
- Address: 15911 Robins Hill Rd #4, London, ON N5V 0A5, Canada
- Map: Click here
- Rating: 4.6 (38)
- Phone: +1 519-471-9999
- Website: Link
- Opening hours:
Monday: 7:30 AM – 6:00 PMTuesday: 7:30 AM – 6:00 PMWednesday: 7:30 AM – 6:00 PMThursday: 7:30 AM – 6:00 PMFriday: 7:30 AM – 6:00 PMSaturday: ClosedSunday: Closed - Reviews:
2 years agoI have had the pleasure of having the team of professionals here at Stronghold assist me with all of my IT needs for many years now at the company I work for. Courteous, responsive, and they get the job done. Sending through a ticket is simple and the technicians are very good at solving your issues even if you aren’t exactly sure what the problem is or how to explain it. They deliver quality service that doesn’t disappoint. Thanks Stronghold.3 years agoI have been a client of Stronghold IT services for over 2 years and I cannot say enough good things about them! Every single technician I have had the pleasure of working with has been exceptionally responsive, knowledgeable, professional and thorough. They hire nothing but the best! I consider Stronghold a partner, providing me guidance on strategic projects and recommending initiatives that will protect data and improve user experiences. I trust their expertise and have full confidence in their security measures, fail safes and continuity of operations to support my organization. They have our back and are looking out for our best interests as clients with information on new features, the latest updates and integrations and best practices information. Typically, when you think of IT solutions, you may think of service providers who respond to problems. Sure – there is that and Stronghold does it most effectively – but an important value added is their forward-thinking approach, understanding of our operations and driving our business to serve clients using technology in ways we may not have considered. While this pandemic has forced us all to do business differently, we have been agile to do better because of the technology available to us. We have been fortunate to have Stronghold working alongside us to forge new ways for making meaningful connections to clients with reliable, responsive and value-added IT services. I’m sure it’s apparent at this point, but to state: I HIGHLY recommend Stronghold IT services.3 months agoKnowledgeable team! Kind staff and quick service. Highly recommended.3 years agoI am the CEO of a non-profit global company. I am not a tech guy which may be one of the reasons I’m so delighted that we can outsource our tech support to Stronghold. They are responsive, knowledgeable, willing to listen well to whatever issue is being experienced and then get it resolved quickly. Perhaps more than all that, they keep our systems running very well so that the problems we experience are minimum. I highly recommend Stronghold!3 years agoWe have been working together for more than two years. During this time we were able to verify the excellent team they have, both on a technical and human level. Highly committed to providing solutions to day-to-day problems. At the equipment level they have always offered us more than necessary. That makes us feel supported, and allows us to focus only on the issues that concern our business without worrying about the systems area.
Premier Business Consulting Group
- Address: 1750 Ernest Ave, London, ON N6E 3H3, Canada
- Map: Click here
- Rating: 4.8 (22)
- Phone: +1 519-601-2244
- Website: Link
- Opening hours:
Monday: 9:00 AM – 5:00 PMTuesday: 9:00 AM – 5:00 PMWednesday: 9:00 AM – 5:00 PMThursday: 9:00 AM – 5:00 PMFriday: 9:00 AM – 5:00 PMSaturday: ClosedSunday: Closed - Reviews:
5 months agoCouldn’t be happier with the services received by Premier Business Consulting. We have never had an issue with our tax returns. In fact they went above and beyond to let us know about tax deductions we were eligible for. We were so happy with their services that we referred my grandmother for her taxes as well. They were able to recommend she apply for GIS as she is living on just a pension. Happy to say she was approved and that extra income has made a real difference for her. We haven’t used anyone else since our first tax year with them and we trust them and their knowledge fully.5 months agoPremier BCG has provided hands down the best tax services my family has ever had. They were able to help our grandmother find programs to supplement her fixed income. We can’t thank Ryan and the team at Premier BCG enough.4 months agoFirst review: Very disappointing experience.Communication was a challenge, their knowledge of tax protocols was shoddy at best. Had copious amounts of challenges with getting things done. When asked why things aren’t done on time, one employee responded: “I have 50 other accounts, plus I’m in school”.
We are now in arrears in payments and have incurred some hefty late payment fees, as well as trying to clarify and rectify their erroneous work.
Would not recommend this company.
Response to owners’ response:
Your response to our review is indicative of the experience we had with your company. Not taking any responsibility, but passing your incompetency to others.
FACTS: 1. Your contract contradicts itself, which we brought to your attention.
2. We did provide all the info you required. Your staff had all the info, yet was not able to access it according to them, as the employee did not work there anymore.
3. Access to ROE web was granted on our 3rd meeting at your office, 2 weeks into us being your customer. We have a screenshot, as well as confirmed by Revenue Canada.
4. Yes, we did have 2 other bookkeepers prior to hiring your company. First was a 19-year-old team member, just out of college. After a few years, and our company growing, we needed more expertise. Second, we had a client who was retired and did bookkeeping. Although she was good, we needed someone who was more adept with online work, and she had challenges with the technology.
5. Yes, we were at your office on multiple occasions. We would have preferred to not be there, but when a company is dealing with our finances, and having so many issues, we needed to help resolve them to ensure things were done correctly. Also, many of the onsite visits were at the behest of your company.
6. The fact that your team was pursuing higher education is wonderful, and we commend that. Our business not getting competent work and service was our issue.
Lastly, if the service and experience we received is your standard, I am sorry for your company and any other customers.
I started our communication with PBG with high hopes, and a bright, long-term partnership. It is unfortunate, as we love to support small businesses, and our first 2 meetings with Ryan Seely were pleasant and we were impressed. Too bad the other 6 months were a disaster.
I wish you all better days ahead, and hopefully, others who use your company receive better service.
5 months agoServices are always great. They take care of all of my personal and corporate taxes quickly, efficiently and correctly. I appreciate all of their hard work. Pleasure to work with.3 years agoRyan did a fantastic job with my 2019 taxes. He’s certainly excels in customer service, promptness, ease of communication and knowledge. All communication was personal and not through emails which I really appreciate. The return time from submitting my forms to Ryan And intern him submitting them to the CRA was exceptional. Any issues that I had were completely resolved and any questions were promptly answered and explained. I highly recommend Premier Business Consulting and will definitely be using them in the future.
Western IT Group Inc
- Address: 415 Hamilton Rd, London, ON N5Z 1S1, Canada
- Map: Click here
- Rating: 4.7 (21)
Acumen Business Consulting Inc.
- Address: 201 King St, London, ON N6A 1C9, Canada
- Map: Click here
- Rating: 5 (17)
INVORG
- Address: 630 Colborne St, London, ON N6B 2V2, Canada
- Map: Click here
- Rating: 4.3 (13)
Thrive Business Consulting
- Address: 22 Picton St Suite 702, London, ON N6B 3R5, Canada
- Map: Click here
- Rating: 5 (8)
Nielsen IT Consulting Inc
- Address: 148 Fullarton St #1700, London, ON N6A 5P3, Canada
- Map: Click here
- Rating:

Discover top consulting firms in various cities, like those mentioned in Kitchener, Hamilton and Toronto, to understand the dynamic business scene across Canada. These companies play a crucial role in shaping the vibrant business environment, positioning London, Ontario, Canada as a center for strategic insights and cutting-edge solutions.
Top IT Consulting Firm Alternatives in London
The Biggest IT Consulting Firm in Canada
London is home to many well-known IT consulting firms that offer a wide range of services to businesses in various industries. Here are three of the top IT consulting firms in London:
- Accenture: Accenture is a global consulting firm that specializes in strategy, technology, operations, and digital transformation. They have a strong presence in London and offer a wide range of services to help businesses innovate and grow. Some of their key areas of expertise include cloud computing, cybersecurity, artificial intelligence, and data analytics. Accenture has a large team of experienced consultants who work closely with clients to create customized solutions that address their unique challenges and opportunities.
- Deloitte: Deloitte is one of the world’s largest professional services firms and has a strong presence in London. They provide a wide range of IT consulting services, including strategy, technology implementation, cybersecurity, and digital transformation. Deloitte’s team of consultants combines deep industry knowledge with technical expertise to help businesses navigate complex digital challenges. They also offer a range of innovative solutions, such as robotic process automation and blockchain, to help businesses streamline operations and improve efficiency.
- KPMG: KPMG is a leading professional services firm that offers a wide range of IT consulting services to clients in London. They have a strong focus on technology transformation and digital innovation and provide services such as IT strategy, technology implementation, cybersecurity, and data analytics. KPMG’s team of consultants work closely with clients to understand their business objectives and develop customized solutions that drive growth and efficiency.
These are just three of the top IT consulting firms in London, and there are many other options to choose from. When selecting an IT consulting firm, it is important to consider the specific needs and goals of your business, as well as the expertise and experience of the consulting firm. Additionally, it can be beneficial to read reviews and testimonials from previous clients to get a better understanding of the firm’s capabilities and track record.
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