The Diocese of Calahorra and La Calzada-Logroño is a Roman Catholic diocese located in northern Spain. It was established in the early Christian period and is part of the ecclesiastical province of Pamplona. The diocese covers the regions of La Rioja and parts of Navarre, serving a diverse population through its various parishes and religious institutions. The diocese's seat is in the city of Logroño, where the Cathedral of Santa María de la Redonda serves as the main church. The diocese is known for its rich history, cultural heritage, and commitment to pastoral care, education, and community service within its jurisdiction.