The Sheikh Said rebellion (Kurdish: Serhildana Şêx Seîd; Turkish: Şeyh Said İsyanı) was a Kurdish nationalist and Islamist rebellion in Southeast Anatolia in 1925 led by Sheikh Said and with support of the Azadî movement and local religious and feudal leaders against the newly-founded secular Turkish Republic. The rebellion was mostly led by Zaza speakers, but also gained support among some of the neighboring Kurmanji-speaking Kurds in the region.

The religious and nationalist background of the Sheikh Said rebellion has been debated by the scholars. The rebellion was described as "the first large-scale nationalist rebellion by the Kurds" by Robert W. Olson.

In the first years of the Turkish Republic, the Turkish state carried out modernist and nationalist reforms on its citizens including Kurdish minority. Mustafa Kemal Pasha, in his speech in Eskişehir on 14 January 1923 about the Mosul-Kirkuk area also addressed the Kurdish issue mentioning: the second issue is the problem of Kurdishness. The British wanted to establish a Kurdish state there (in northern Iraq). If they do, this thought spreads to the Kurds within our borders. To prevent this, we need to cross the border South. In the report the British spokesman sent to London on the 28 November 1919 he stated; "Even though we don't trust the Kurds, it is our interests to use them." The British Prime Minister Lloyd George, on the 19 May 1920 at the San Remo Conference stated that "the Kurds cannot survive without a large state behind them," he says, for the British policy towards the region said: "A new protective admission to all Kurds accustomed to the Turkish administration It will be difficult to bring the British interests to Mosul, where the Kurds live in the mountainous regions and Southern Kurdistan in which they live. It is thought that the region of Mosul could be separated from other parts and connected to a new independent Kurdistan State. However, it would be very difficult to resolve this issue by agreement.

Mosul dispute between the UK and Turkey in Lausanne conference dealt with the bilateral talks, if this were to fail it was decided to have recourse the subject to the League of Nations. On 19 May 1924, the results of the negotiations in Istanbul could not be reached and Britain took the issue on 6 August 1924 to the League of Nations. The Sheikh Said uprising emerged during the days when British occupation forces declared martial law in northern Iraq, removed their officer's permits, and carried their troops to Mosul. In those days, the Colon of Ministers was increasingly under scrutiny, and a powerful British fleet was moving to Basra.

Prior to Sheikh Said's rebellion, the prominent Pashas of the War of Independence worried about the anti-religious and autocratic policy of Atatürk's government and therefore on 17 November 1924, the Terakkiperver Cumhuriyet Fırkası (TCF), the first opposition party in the history of the Republic was established. There was a general consensus that Atatürk's actions were against religion. In the TCF's article which led by Kazım Karabekir it says that "The political party is respectful to the religious beliefs and thoughts". One of the TCF officials, Fethi Bey, said "The members of the TCF are religious. CHF is messing up with the religion, we will save the religion and protect it".

Two weeks before the Sheikh Said incident, in late January 1925, the TCF Erzurum deputy Ziyaeddin Efendi, with heavy criticism of the actions of the ruling CHF in the chair of the Grand National Assembly, said that 'innovation' had led to the encouragement of "isret" (getting drunk), an increase in prostitution, Muslim women losing their decency and, most important of all, religious customs being dishonored and disregarded by the new regime. The Azadî forces under the lead of Halid Beg Cibran were dominated by the former members of the late Ottoman era Hamidiye regiments, a Kurdish tribal militia established during the reign of Sultan Abdul Hamid II to deal with the Armenians, and sometimes even to keep the Qizilbash under control. According to various historians, the main reason the revolt took place was that various elements of the Turkish society were unhappy with the Turkish Parliament's abolition of the Ottoman Caliphate on 3 March 1924. According to British intelligence reports, the Azadî officers had 11 grievances. Apart from Kurdish cultural demands and complaints of Turkish maltreatment, this list also detailed fears of imminent mass deportations of Kurds. They also registered annoyance that the name Kurdistan did not appear on maps, at restrictions on the Kurdish language and on Kurdish education and objections to alleged Turkish economic exploitation of Kurdish areas, at the expense of Kurds. The revolt was preceded by the smaller and less successful Beytüssebap revolt in September 1924, led by Cibran and Ihsan Nuri on the orders by the prominent Azadî member Ziya Yusuf Bey. The revolt was subdued, and its leaders Cibran and Ziya Yusuf Bey were captured and courtmartialed in Bitlis.

Sheikh Said appealed to all Muslims of Turkey to join in the rebellion being planned. The tribes which actually participated were mostly Kurds and Zazas. Kurds of the Xormak and Herkî, two Kurdish-Qizilbash tribes were the most active and effective opponents of this rebellion since they had experience in confronting the Turkish government. The Azadî, and several Kurdish officers from the Ottoman Empire also supported the rebellion. Historian Robert Olson states that viewing the several sources, an estimated number of 15,000 rebels is about the average of the number of involved rebels which took part in the revolt.

That some Alevi tribes who participated in the Koçgiri rebellion refused to join the rebellion was a major setback as they had a lot of other tribes also desisted from supporting the rebellion, as their leaders preferred to be in good standing with the Turkish government. Some claim British assistance was sought realizing that Kurdistan could not stand alone. The Kurdish population in around Diyarbakır, farmers as well as Kurdish notables, also desisted. The influential Kurdish Cemilpasazade family even supported the Turkish Government. Also the ruler of Cizre, Sheikh Saida and the powerful Sheikh Ziyaettin from Norşin would not support the rebellion and preferred an arrangement with the Kemalists. Despite Sheikh Said's religious identity, there was no significant participation in the rebellion among Turkish Muslims. Sheikh Said's statement that "killing one Turk is better than killing seventy infidels" shows that the rebellion created a new type of radicalism by combining Islamist extremism and hostility towards Turks. This also explains why the rebellion was strong only in a few Kurdish-majority cities.