Caspian X, King of Narnia, Lord of Cair Paravel and Emperor of The Lone Islands, also called Caspian the Seafarer and Caspian the Navigator, is a fictional character in The Chronicles of Narnia by C. S. Lewis. He is featured in three books in the series: Prince Caspian, The Voyage of the Dawn Treader, and The Silver Chair. He also appears at the end of The Last Battle.

Caspian is described as noble, handsome, brave and merry; he strives for fairness and justice at all times and is a devoted King. For his love of the sea he is known as Caspian the Seafarer.

Lewis introduces Caspian as the young nephew of and heir to King Miraz of Narnia. By this time 1300 years have passed since the rule of High King Peter and his siblings, and Old Narnians no longer live openly in Narnia, having been driven into hiding by Caspian's ancestors, the Telmarines. In fact, the talking beasts are believed to be mythical, and stories of them are forbidden in Miraz's castle.

When Caspian is a small boy (by which time both of his parents are dead), his nurse tells him of these stories, which fascinate him; but when he mentions them in the presence of his uncle, Miraz rebukes Caspian and dismisses the nurse.

Caspian can refer to:

"Caspian" comes from the word "Caspi" which is the name of old Caucasian Albanian tribe lived on the coast Caspian sea and their province were Caspiana and renamed now Caspian sea.