| Alexander Comyn, 2nd Earl Buchan | |
| Birth Date: | Unknown (circa 1218) |
| Birth Place: | Buchan, Aberdeenshire |
| Death Date: | Unknown (late 1289) |
| Death Place: | Northern Scotland |
| Office1: | Guardian of Scotland |
| Term Start: | 1286 |
| Term End: | 1289 |
| Predecessor1: | Donnchadh IV, Earl of Fife |
| Successor1: | James Stewart, 5th High Steward of Scotland |
| Office2: | Justiciar of Scotia |
| Term Start2: | 1258 |
| Term End2: | 1289 |
| Predecessor2: | Alan Durward |
| Successor2: | Andreas de Moravia |
| Office3: | Constable of Scotland |
| Term Start3: | 1275 |
| Term End3: | 1289 |
| Predecessor3: | Marjory, Countess of Buchan |
| Successor3: | John Comyn, Earl of Buchan |
| Occupation: | Sheriff, Baillie |
| Spouse: | Elizabeth de Quincy |
| Children: | Roger, Marjorie, Elisabetha, William, Emma, John, Elena |
| Parents: | William Comyn, Lord of Badenoch Marjory, Countess of Buchan |
| Footnotes: | Also served as Sheriff of Wigtown and Dingwall and Baillie of Inverie. Dates of rule unknown. |
Alexander Comyn, 2nd Earl of Buchan (died 1289) was a Scoto-Norman magnate who was one of the most important figures in the 13th century Kingdom of Scotland. He was the son of William Comyn, Lord of Badenoch, and Marjory, Countess of Buchan, the heiress of the last native Scottish Mormaer of Buchan, Fergus. He was the chief counsellor of Alexander III, King of Alba (Scotland) for the entire period of the king's majority and as Scotland's leading magnate, played a key role in safeguarding the independence of the Scottish monarchy. During his long career, Alexander Comyn was Justiciar of Scotia (1258–1289), Constable of Scotland (1275–1289),[1] Sheriff of Wigtown (1263–1266), Sheriff of Dingwall (1264–1266), Baillie of Inverie (in Knoydart) and finally, Guardian of Scotland (1286–1289) during the first interregnum following the death of Alexander III. In 1284 he joined with other Scottish noblemen who acknowledged Margaret of Norway as the heiress to King Alexander.[2] He died sometime after 10 July 1289.
Alexander had at least nine children with his wife, Elizabeth, daughter of Roger de Quincy, 2nd Earl of Winchester: