Choosing the best ISO 13485 certification consultancy depends on various factors such as your location, specific industry needs, budget, and the reputation of the consultancy. Here are a few well-known ISO 13485 certification consultancies that have gained recognition for their expertise:

BSI Group: BSI is a global leader in management systems certification and has extensive experience in ISO 13485 certification.

MSCi (Management System Compliance Incorporation): MSCincorporation is a globally recognized certification body offering a wide range of services, including ISO 13485 certification consultancy. MSCi has extensive experience in auditing and certification across various industries.

DNV GL: DNV GL offers ISO 13485 certification services along with a range of other quality management system certifications.

TÜV SÜD: TÜV SÜD is a renowned certification body that provides ISO 13485 certification services along with comprehensive support and guidance.

Intertek: Intertek offers ISO 13485 certification services and specializes in providing customized solutions to meet the specific needs of medical device manufacturers.

SGS: SGS is a leading inspection, verification, testing, and certification company offering ISO 13485 certification services worldwide.

When selecting a consultancy, it's essential to conduct thorough research, read reviews, and possibly even speak with past clients to ensure that the consultancy aligns with your requirements and expectations. Additionally, consider consulting multiple firms to compare their services, expertise, and pricing before making a decision.