The 26th International Bach Chamber Music Festival is a chamber music concert in Riga at the LNVM Riga Castle in December 2026. The programme includes all surviving 16th-century vocal polyphony created in the territory of Latvia, with a focus on the works of Paul Bucēns and other composers from the Riga Cathedral School. Ensemble Ars Antiqua Riga will perform under the artistic direction of Pēteris Vaickovskis. Gregorian chant is also featured. Ars Antiqua Riga specialises in early music, particularly vocal polyphony.