Sévignac (French pronunciation: [seviɲak]; Breton: Sevinieg) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.

[4] Sévignac comes from the Latin name Sabinius (a name of a veteran of the Roman legion who was awarded for his bravery around the time of Christ), and the Gaulish suffix acos.

Such allocations were made at a time when, as a result of a demographic decline, a shortage of labor left a number of undeveloped lands.

In the twelfth century, the Cistercian monks of Boquen built a barn and farm inhabited by lay people, which led to the prosperity to the hamlets of Pengave and Pengly, as well as the construction of the Chapel of Saint Cado.

Sévignac saw the birth of the last bishop of Tréguier, Augustin-René-Louis Le Mintier (1729-1801), as well as Joseph Picot de Limoëlan, one of the perpetrators of the Plot of the rue Saint-Nicaise to kill Napoleon Bonaparte and his wife.