Results breakdown of the 1991 Spanish local elections (Basque Country)

This is the results breakdown of the local elections held in the Basque Country on 26 May 1991. The following tables show detailed results in the autonomous community's most populous municipalities, sorted alphabetically.

City control
The following table lists party control in the most populous municipalities, including provincial capitals (shown in bold). Gains for a party are displayed with the cell's background shaded in that party's colour.

Barakaldo

 * Population: 108,588

Basauri

 * Population: 50,941

Bilbao

 * Population: 383,798

Donostia-San Sebastián

 * Population: 183,944

Getxo

 * Population: 81,795

Irun

 * Population: 55,200

Portugalete

 * Population: 57,156

Rentería

 * Population: 42,441

Santurtzi

 * Population: 51,706

Vitoria-Gasteiz

 * Population: 209,506