The Elhuyar Science Fair is an event organized by Elhuyar Fundazioa.

The Fair showcases projects developed by young people, allowing them to experience research and development firsthand. The Elhuyar Science Fair aims to provide STEAM experiences for young people with the involvement of the entire community.

It is a network of project fairs for young people between 12 and 18 years old. The fair is primarily for young people from the Basque Country, but groups are also invited from other science fairs abroad.

The fair in Bilbao is the final and most important one. It is open to students and non-students who have participated in other fairs. Awards include trips to foreign science fairs and stays at research centers.

The TSR Lab has participated for many years since the 2016 edition. 

In the 2025 edition, the Bilbao fair will be the only one with evaluators. At the others, students will present their work to passersby, and there will be no prize winners, although some prizes will be drawn among all participants.

It will be held in Paseo del Arenal (Bilbao) in 28-31 May 2025. Some TSR Lab members are participating in the 2025 edition as evaluators.