In Nigeria, several firms are well-regarded for providing ISO certification services across various standards. Here are some top ISO certification firms in Nigeria:

1. Qodar Safety Consults: Qodar Safety Consults is known for its extensive consulting services, QSC offers specialized safety in Bespoke Technical Safety Skill Courses, Management Soft Skill Training, ISO Courses, and other health and safety consulting services.
2. Bureau Veritas Nigeria – A leading global provider of ISO certification services, Bureau Veritas offers certification for a wide range of ISO standards, including ISO 9001, ISO 14001, ISO 45001, and more.
3. SGS Nigeria – SGS is a major player in the certification industry, offering ISO certification services for various standards and ensuring compliance and quality across multiple sectors.
4. DQS Nigeria – A subsidiary of DQS Holding, DQS Nigeria provides ISO certification and management system audits for standards like ISO 9001, ISO 14001, and ISO 45001.
5. TÜV Rheinland Nigeria – Part of the TÜV Rheinland Group, this firm offers ISO certification services and is known for its rigorous assessment processes and expertise in quality and safety standards.
6. Certiquality Nigeria – Specializes in ISO certification and provides services for a range of ISO standards, including quality management, environmental management, and occupational health and safety.

These firms are recognized for their expertise and reputation in the ISO certification field, helping organizations achieve and maintain ISO standards in Nigeria.