Eibar lies at an altitude of 121m above sea level, in the west of the province of Gipuzkoa, right next to Biscay. Eibar has an oceanic climate. The town lies in a narrow valley in a mountainous area, the highest mountains are between 700 and 800 metres high. Eibar is traversed by river Ego, which is a tributary of the Deba.

Apart from the urban area, the municipality consists of five rural neighbourhoods: Otaola-Kinarraga, Aginaga, Arrate, Mandiola and Gorosta.

Main sights include:

• Church of San Andres, built during the 16th and 17th centuries, it has a Gothic style with Renaissance and Baroque elements.
• Sanctuary of the Virgin of Arrate, from the beginning of the 17th century.
• Hermitage of Azitain, it contains an odd 17th-century beardless Christ.
• Palace of Unzueta, from the 17th century.
• Palace of Aldatze, from the 17th century.
• Palace of Markeskua, from the 16th century.
• City Hall, built in concrete over the river Ego, designed by architect Ramon Cortazar and inaugurated on 14 September 1901.
• Coliseo Theatre, inaugurated in 1947 and refurbished in 2007.