Saif al-Islam Al-Hassan bin Yahya Hamid ad-Din
الحسن بن يحيى حميد الدين
Prime Minister of the Mutawakkilite Kingdom of Yemen
In office April 1948 – August 1955
Monarch	Ahmad bin Yahya
In office 1962–1967
Monarch	Muhammad al-Badr (in exile)
In office 1969–1970
Monarch	Muhammad al-Badr (in exile)
Personal details
Born	(1908-06-13)June 13, 1908
Died	June 13, 2003(2003-06-13) (aged 95)
Parent	Yahya Muhammad Hamid ed-Din (father)

Al-Hassan Hamid al-Din ibn Yahya (13 June 1908 – 13 June 2003) was a Yemeni royal and statesman who served as the Prime Minister of the Mutawakkilite Kingdom of Yemen, once from April 1948 to August 1955, a second time from 1962 to 1967, and a third time from 1969 to 1970.

He was born at Al-Qafla, Hashid. He was the third oldest of king Yahya's fourteen sons. During his father's reign, he was Governor of Ibb Province (1938–1948). After his father's assassination, he supported his older brother Ahmad in becoming King of Yemen. Following a coup attempt by their younger brother Abdullah, he was dismissed as prime minister after being wrongfully suspected of supporting the coup attempt. He was appointed head of North Yemen's delegation to the UN. After the republican coup, the attack on his nephew King Muhammad's residence Dar al-Bashair, and the king's rumored death, ibn Yahya proclaimed himself King and traveled to Saudi Arabia, where he learned that his nephew was still alive. He subsequently withdrew his claim to the throne. He was appointed prime minister of the government-in-exile and served two terms (1962–1967, 1969–1970). He died in Jeddah, Saudi Arabia, on his 95th birthday.

His title was Saif Al-Islam.

• Knight Grand Cross of the Order of Merit of the Italian Republic (13 January 1953).^{[citation needed]}