| Honorific Prefix: | His Excellency |
| Muhammad Najib ar-Ruba'i | |
| Office: | 1st President of Iraq |
| Term Start: | 14 July 1958 |
| Term End: | 8 February 1963 |
| Primeminister: | Abd al-Karim Qasim |
| Predecessor: | Faisal II (as the King of Iraq) |
| Successor: | Abdul Salam Arif |
| Birth Date: | 1904 7, df=y |
| Birth Place: | Baghdad, Baghdad Vilayet, Ottoman Empire |
| Death Place: | Baghdad, Iraq |
| Occupation: | President of Iraq (1958 - 63) |
| Rank: | Lieutenant General |
| Nationality: | Iraqi |
| Party: | Independent |
| Branch: | Army |
| Allegiance: |  Iraq |
| Signature: | Muhammad Najib ar-Ruba'i signature.jpg |
| Serviceyears: | 1924-1963 |
| Native Name Lang: | ar |
Muhammad Najib ar-Ruba'i (Arabic: محمد نجيب الربيعي) (also spelled Al-Rubaiy) (1904 - 1965) was the first president of Iraq (Chairman of Sovereignty Council), from 14 July 1958 to 8 February 1963.[1] Together with Abdul Karim Qassim,[2] he was one of the leaders of the 14 July Revolution that toppled King Faisal II in 1958.
While Qassim became prime minister and held most of the power, Ar-Ruba'i was elected head of state with the title of Chairman of the Sovereignty Council. The Sovereignty Council had a representative from each of the communal/ethnic groups. Ar-Ruba'i represented the Sunni community.
In 1963, Qassim was deposed by another coup led by Abd as-Salam Arif. Ar-Ruba'i had to retire from politics. Ar-Ruba'i died in 1965.