Côte-d'Or (IPA: [kot dɔːʁ]; English: Golden Hillside) is a department in the eastern part of France.

Côte-d'Or is one of the original 83 departments created during the French Revolution on 4 March 1790. It was formed from part of the former province of Burgundy.

The department is part of the current region of Bourgogne. It is surrounded by the departments of Yonne, Nièvre, Saône-et-Loire, Jura, Aube, and Haute-Marne.

A chain of hills called the Plateau de Langres runs from north-east to south-west through the department to the north of Dijon and continues south-westwards as the Côte d'Or escarpment, which is named from the department's name. It is the south-east facing slope of the escarpment which is the site of the celebrated Burgundy vineyards. To the west of the Plateau de Langres, towards Champagne, lies the densely wooded district of Châtillonais. To the south-east of the plateau and escarpment, the department lies in the broad, flat-bottomed valley of the middle course of the Saône.