Hujjat al-Islam is an Islamic honorific title which translates in English to "authority on Islam" or "proof of Islam".
The title "Hujjat al-Islam" is given to scholars with a high level of Islamic expertise and Islamic theology. Essentially, one who acquires this title is considered to be a respectful authority to Islam. The person with this title is also able to provide guidance and clarify topics on issues in the Islamic community. The term "Hujjat al-Islam" has different connotation to Sunnis and Shias.