Ahmed ben Moussa (Arabic: أحمد بن موسى‎; died 1900) commonly known as Ba Ahmed (با أحمد) was , or grand vizier, of Morocco and de facto ruler of the kingdom between the 1894 and 1900. He became the country's true regent, after enthroning his nephew Abd al-Aziz as sultan, who was a child at the time, despite there being older siblings. Ba Ahmed's rule, as the rule of Moulay Hassan before him, of whom his was grand vizier, continued to entangle Morocco in financial and political crisis, with catastrophic reforms to the tax and duty systems, and deepened the dependency of the throne —who could hardly collect any taxes— on foreign powers to quell rebellions, pay soldiers and servants and ultimately stay in power.