Yes, this is a legal requirement in Qatar. Article 6 of Law No. 25 of 2005 states that every person entered in the Commercial Registry must write their trading name and registration number on their business frontage and in all correspondence, publications, and papers relating to their trade. This includes items such as invoices, letterheads, contracts, emails, and any marketing materials connected to your commercial activity.
Failure to comply with this requirement can result in penalties under Article 15, which provides for a fine of up to QAR 10,000, imprisonment of not more than one month, or both. Enforcement officers from the Ministry have the authority to inspect premises and documents under Article 17, so non-compliance is a real risk.
For expat business owners, a practical approach is to ensure your Commercial Registry (CR) number appears on all printed stationery, your website, your shop signage, and any digital communications related to the business from day one. If you rebrand or move premises, update your signage promptly. Keeping your displayed details current also helps if you need to update your registration — any changes should be noted in the registry as allowed under Article 9.
This is general legal information, not legal advice. For advice on your specific situation, consult a lawyer licensed in Qatar.