Aloysius Paul D'Souza is the former Bishop of the Roman Catholic Diocese of Mangalore. He was consecrated on 8 November 1996, succeeding his predecessor Basil Salvadore D'Souza.

The Diocese of Mangalore is a Latin Church ecclesiastical jurisdiction or diocese of the Catholic Church located in the city of Mangalore, India. The diocese is a suffragan in the ecclesiastical province of the metropolitan Archdiocese of Bangalore. At present, it comprises the whole civil districts of Dakshina Kannada and Udupi in Karnataka state. The area of the Diocese was collectively referred to as South Canara during the Company rule in India, in the subsequent British India after Direct rule from London commenced & in the early post-independence Bombay state, prior to the States Reorganisation Act (1956). It was established as a separate Apostolic Vicariate from the Apostolic Vicariate of Verapoly in 1853, and was promoted to a diocese on 1 September 1886.