Muhammad bin Abdul Rahman Al Saud (Arabic: محمد بن عبد الرحمن آل سعود Muḥammad bin ʿAbd ar Raḥman Āl Suʿūd; c. 1877 – 25 July 1943) was an Arabian soldier and politician who played a role in the conquests of his half-brother Abdulaziz that led to the formation of the Kingdom of Saudi Arabia.

Muhammad was the son of the last emir of Nejd, Abdul Rahman bin Faisal, and Sara bint Jiluwi, both from the House of Saud.

Muhammad was an early supporter of his half-brother, King Abdulaziz,[1] but they had a falling-out after both attempted to place their sons in line for kingship.

"[7][3] There is some controversy regarding Muhammad's date of birth, with some sources making him older than Abdulaziz, an important factor in his later maneuvering for the succession.

[11] In that battle the Al Ajman tribe wounded Abdulaziz and killed Muhammad's younger half-brother Saad bin Abdul Rahman.

[12] In 1920 Muhammad and his nephew Prince Saud, eldest surviving son of Abdulaziz, were sent to capture the Hail Province.

[24] It was the period between their first and second marriages that Hussa bint Ahmed married King Abdulaziz’s younger half brother, Muhammad.

It is assumed that King Abdulaziz remained in love with Hussa bint Ahmed, and therefore, forced his half-brother to divorce her so that he could remarry her.

[14] Following his settlement in Mecca in 1935 Muhammad, married a daughter of Abdullah bin Hasan Al Sheikh, chief qadi of the country.

who married King Abdulaziz's daughter Sheikha and was the governor of Al Qassim Province[21] who was appointed to the post on 29 June 1969.

[32] Muhammad bin Abdul Rahman died in Riyadh on 25 July 1943[21][8] and was buried in Al Oud cemetery there.