| Bahir Mustafa | |
| Honorific-Suffix: | Pasha |
| Office1: | Grand Vizier of the Ottoman Empire |
| Term Start1: | 12 July 1752 |
| Term End1: | 17 February 1755 |
| Predecessor1: | Divittar Mehmet Pasha |
| Successor1: | Hekimoğlu Ali Pasha |
| Office2: | Grand Vizier of the Ottoman Empire |
| Monarch2: | Osman III |
| Term Start2: | 1 April 1756 |
| Term End2: | 3 December 1756 |
| Predecessor2: | Yirmisekizzade Mehmet Sait Pasha |
| Successor2: | Koca Ragıp Pasha |
| Office3: | Grand Vizier of the Ottoman Empire |
| Monarch3: | Mustafa III |
| Term Start3: | 1 November 1763 |
| Term End3: | 30 March 1765 |
| Predecessor3: | Tevkii Hamza Hamit Pasha |
| Death Date: | 1765 |
| Death Place: | Lesbos, Ottoman Empire |
| Nationality: | Turkish |
| Blank1: | Origins |
| Profession: | Civil servant |
Köse Bahir Mustafa Pasha was an Ottoman grand vizier. His epithet Köse means "beardless". He was also known as Çorlulu Bahir Mustafa Pasha referring to his home town Çorlu. Before being grand vizier he was an imrahor ("governor of the royal stables").
He was appointed as the grand vizier by the sultan Mahmut I on 1 July 1752. But the Sultan died on 14 December 1754. The new sultan Osman III dismissed Köse Bahir Mustafa Pasha from the post on 17 February 1755. He was exiled to Midilli (Lesbos, now a Greek island). Later he was moved to Morea (now in Greece).[1]
His second term as the grand vizier was quite short. He was appointed on 30 April 1756 and was dismissed on 3 December 1756. He was exiled to Rhodes (now a Greek island) But the new grand vizier Koca Ragıp Pasha was a friend of Köse Bahir Pasha and he helped him to be appointed to various posts in Midilli and Eğriboz (Euboea, now a Greek island). On 11 June 1758 he was appointed as the governor of Egypt, a seat he kept till 1762. Although he was appointed to the governorship of Aleppo (now in Syria) he refused to go the Aleppo.[1]
His last term as the grand vizier began on 1 November 1763 during the reign of Mustafa III. However he was accused of corruption. He was dismissed on 30 March 1765. The next month he was executed in Midilli.[1]