Is it necessary that the stamp of gazetted officer must be in English only?

No, it is not strictly necessary for the stamp of a gazetted officer to be in English only. Many documents can be stamped in regional languages, depending on the context and the requirements of the issuing authority. However, for official purposes, especially in multi-lingual contexts or international documentation, English is often preferred for clarity and wider understanding. Always check the specific requirements of the relevant authority to ensure compliance.