The 17th Trans-European School of High Energy Physics will take place in Suceava from July 10 to July 18, 2026. The core lecture program addresses Experimental Particle Physics, Standard Model and Beyond, Accelerators, Cosmology and Instrumentation. The lectures are complemented by Topical workshops, seminars, practical sessions and student-professor discussions. Students will present their projects during a dedicated conference at the end of the school.