Ali Hasan al-Ahmadi (; born 1956) is a Yemeni politician and diplomat. He has been serving as ambassador of Yemen to Bahrain since 2016.
He was born in 1956 in Shabwah. He got a PhD in economics in 1991. He held many positions, including governor of Al Baydha Governorate in 1991, and then govern of Hajjah Governorate before his appointment as Minister of Fisheries in 2001. He later served as ambassador of Yemen to Kuwait in 2003. He was elected as governor of Shabwah in 2008 and in 2012 was appointed as chief of National Security Bureau.