The Diocese of Alcalá de Henares is a Roman Catholic diocese located in the community of Madrid, Spain. Established in 1991, it was formed from parts of the Archdiocese of Madrid and the Diocese of Getafe. The diocese serves the spiritual needs of its local population and is part of the larger ecclesiastical province of Madrid. The cathedral of the diocese is the Catedral de Alcalá de Henares, which is dedicated to Saint Justus. The diocese oversees various parishes, schools, and social services, promoting the Catholic faith and community engagement within its jurisdiction.