The Diocese of Peoria is a Roman Catholic diocese located in central Illinois, established in 1877. It serves a diverse population of Catholics across several counties, providing spiritual guidance, education, and community services. The diocese is part of the larger Archdiocese of Chicago and is led by a bishop who oversees its various parishes and ministries. The diocese is known for its commitment to education, operating numerous schools and religious education programs. It also emphasizes social justice and outreach, engaging in various charitable activities to support the local community. The Cathedral of St. Mary of the Immaculate Conception serves as the diocese's central church.