Mihail Kogălniceanu OSR (Romanian pronunciation: [mihaˈil koɡəlniˈtʃe̯anu] ^ⓘ; also known as Mihail Cogâlniceanu, Michel de Kogalnitchan; September 6, 1817 – July 1, 1891) was a Romanian liberal statesman, lawyer, historian and publicist; he became Prime Minister of Romania on October 11, 1863, after the 1859 union of the Danubian Principalities under Domnitor Alexandru Ioan Cuza, and later served as Foreign Minister under Carol I. He was several times Interior Minister under Cuza and Carol. A polymath, Kogălniceanu was one of the most influential Romanian intellectuals of his generation. Siding with the moderate liberal current for most of his lifetime, he began his political career as a collaborator of Prince Mihail Sturdza, while serving as head of the Iași Theater and issuing several publications together with the poet Vasile Alecsandri and the activist Ion Ghica. After editing the highly influential magazine Dacia Literară and serving as a professor at Academia Mihăileană, Kogălniceanu came into conflict with the authorities over his Romantic nationalist inaugural speech of 1843. He was the ideologue of the abortive 1848 Moldavian Revolution, authoring its main document, Dorințele partidei naționale din Moldova.

Following the Crimean War (1853–1856), with Prince Grigore Alexandru Ghica, Kogălniceanu was responsible for drafting legislation to abolish Roma slavery. Together with Alecsandri, he edited the unionist magazine Steaua Dunării, played a prominent part during the elections for the ad hoc Divan, and successfully promoted Cuza, his lifelong friend, to the throne. Kogălniceanu advanced legislation to revoke traditional ranks and titles, and to secularize the property of monasteries. His efforts at land reform resulted in a censure vote, leading Cuza to enforce them through a coup d'état in May 1864. However, Kogălniceanu resigned in 1865, following his own conflicts with the monarch.

A decade later, he helped create the National Liberal Party, before playing an important part in Romania's decision to enter the Russo-Turkish War of 1877–1878—a choice which consecrated her independence. He was also instrumental in the acquisition, and later colonization, of the Northern Dobruja region. During his final years, he was a prominent member and one-time President of the Romanian Academy, and briefly served as Romanian representative to France.

Born in Iași, he belonged to the Kogălniceanu family of Moldavian boyars, being the son of Vornic Ilie Kogălniceanu, and the great-grandson of Constantin Kogălniceanu (noted for having signed his name to a 1749 document issued by Prince Constantine Mavrocordatos, through which serfdom was disestablished in Moldavia). Mihail's mother, Catinca née Stavilla (or Stavillă), was, according to Kogălniceanu's own words, "[from] a Romanian family in Bessarabia". The author took pride in noting that "my family has never searched its origins in foreign countries or peoples". Nevertheless, in a speech he gave shortly before his death, Kogălniceanu commented that Catinca Stavilla had been the descendant of "a Genoese family, settled for centuries in the Genoese colony of Cetatea Albă (Akerman), whence it then scattered throughout Bessarabia".^{[non-primary source needed]}

During Milhail Kogălniceanu's lifetime, there was confusion regarding his exact birth year, with several sources erroneously indicating it as 1806; in his speech to the Romanian Academy, he acknowledged this, and gave his exact birth date as present in a register kept by his father. It was also then that he mentioned his godmother was Marghioala Calimach, a Callimachi boyaress who married into the Sturdza family, and was the mother of Mihail Sturdza (Kogălniceanu's would-be protector and foe).

Kogălniceanu was educated at Trei Ierarhi monastery in Iași, before being tutored by Gherman Vida, a monk who belonged to the Transylvanian School, and who was an associate of Gheorghe Șincai. He completed his primary education in Miroslava, where he attended the Cuénim boarding school. It was during this early period that he first met the poet Vasile Alecsandri (they studied under both Vida and Cuénim), Costache Negri and Cuza. At the time, Kogălniceanu became a passionate student of history, beginning his investigations into old Moldavian chronicles.

With support from Prince Sturdza, Kogălniceanu continued his studies abroad, originally in the French city of Lunéville (where he was cared for by Sturdza's former tutor, the abbé Lhommé), and later at the University of Berlin. Among his colleagues was the future philosopher Grigore Sturdza, son of the Moldavian monarch. His stay in Lunéville was cut short by the intervention of Russian officials, who were supervising Moldavia under the provisions of the Regulamentul Organic regime, and who believed that, through the influence of Lhommé (a participant in the French Revolution), students were being infused with rebellious ideas; all Moldavian students, including Sturdza's sons and other noblemen, were withdrawn from the school in late 1835, and reassigned to Prussian education institutions.

During his period in Berlin, he came in contact with and was greatly influenced by Friedrich Carl von Savigny, Alexander von Humboldt, Eduard Gans, and especially Professor Leopold von Ranke, whose ideas on the necessity for politicians to be acquainted with historical science he readily adopted. In pages he dedicated to the influence exercised by Georg Wilhelm Friedrich Hegel on Romanian thought, Tudor Vianu noted that certain Hegelian-related principles were a common attribute of the Berlin faculty during Kogălniceanu's stay. He commented that, in later years, the politician adopted views which resonated with those of Hegel, most notably the principle that legislation needed to adapt to the individual spirit of nations.