Jesús Guridi Bidaola (25 September 1886 – 7 April 1961) was a Spanish Basque composer who was a key player in 20th century Spanish and Basque music. His style fits into the late Romantic idiom, directly inherited from Wagner, and with a strong influence from Basque culture. Among his best known works are the zarzuela El Caserío, the opera Amaya, the orchestral work Ten Basque Melodies and his organ works, where the Triptych of the Good Shepherd can be highlighted.
Guridi was born in Vitoria-Gasteiz into a family of musicians. His mother, Maria Trinidad Bidaola, was a violinist and his father, Lorenzo Guridi, was a pianist. After completing his early studies with the Piarists and the Jesuits of Zaragoza, he moved to Madrid, where he received lessons from Arina Valentin. Later, in Bilbao, he was involved in the activities of the society called "El Cuartito". He received violin lessons from Lope Alana and studied harmony with José Sáinz Besabe. On 28 January 1901 he gave his first public concert with the Philharmonic Society of Bilbao. At the age of 18 he enrolled in the Schola Cantorum in Paris, studying organ with Abel Decaux, composition with Auguste Sérieyx, and fugue and counterpoint with Vincent d'Indy. Here he met Jose Maria Usandizaga, with whom he developed a deep friendship.
He then moved to Brussels, where he studied with Joseph Jongen and in Cologne with Otto Neitzel, following the recommendations of Resurrección Maria de Azcue. In June 1912 he was appointed director of the Bilbao Choral Society. In the same year his friend Usandizaga died.
In 1922 he married Julia Ispizua. The couple had six children: Maria Jesus, Luis Fernando, Maria Isabel, Ignacio, Julia, and Javier. In 1944 he began working at the Madrid Conservatory, where, years later, he became director.