Sa'ad bin Abdul Rahman Al Saud

Saudi royal, brother and supporter of King Abdulaziz (1890–1915)

Sa'ad bin Abdul Rahman Al Saud (1890–1915) was the brother of Abdulaziz, Emir of Nejd (who later founded the Kingdom of Saudi Arabia). He was one of Abdulaziz's most devoted supporters and a key lieutenant in his early military campaigns.

Sa'ad was born in 1890. He was the youngest son of the reigning Emir of Nejd, Abdul Rahman bin Faisal, from his marriage to Sara bint Ahmed Al Sudairi. He also had a number of half siblings from his father's other marriages, including Muhammad, Abdullah, Ahmed, and Musaid, who all had roles in the Saudi government. The Al Saud family were exiled shortly after Sa'ad's birth, settling in Kuwait. After his brother Abdulaziz captured Riyadh, Sa'ad returned there. Kuwaiti ruler Mubarak Al Sabah sent nearly seventy warriors to Riyadh who were led by Sa'ad. However, Sa'ad was attacked and captured in Al 'Iridh area by the Al Shiyabiyn clan, who belonged to the 'Utaybah tribe. His companion Faraj ibn Lihif was killed in the same incident. Sa'ad was killed in the battle of Kanzan against the Ajman tribe in 1915. In the same battle which occurred in Al Ahsa region Emir Abdulaziz was wounded. The Ajman tribe forces were led by Rakan bin Hithlain, the maternal great grandfather of the Saudi crown prince Mohammed bin Salman.

One of Sa'ad's wives, Sara bint Abdullah Al Sheikh, was the sister of Tarfa bint Abdullah, mother of King Faisal. Another of his wives was Jawhara bint Saad Al Sudairi. Following the death of Sa'ad she married Abdulaziz, with whom she had at least four children. Sa'ad's sons, Faisal, Fahd, and Saud, were taken in by Abdulaziz and raised as part of his own family. They later married to King Abdulaziz's daughters. Of them, Prince Faisal bin Sa'ad married the King's daughter Sara bint Abdulaziz. Sara's half sister Al Anoud married two sons of Sa'ad bin Abdul Rahman. Sa'ad's grandson, Bandar bin Saud, a former air force pilot, was among the victims in the Swissair Flight 111 accident on his way from New York City to Geneva on 2 September 1998.