The Roman Catholic Diocese of Penang is situated in the northern as well as the east coast region of Peninsular Malaysia covering 4 northern states, namely Perlis, Kedah, Penang and Perak as well as the east coast state of Kelantan.

In 1786, Captain Francis Light and his men landed in Penang and decided to build a church there.

A few years, later, another priest settled in Penang and used the College General place as their church.

In 1810, Msgr Garnault as parish priest of the Assumption Church assumed leadership of the Vicariate of Siam and Kedah.

In 1972, the Archdiocese of Malacca became the new Diocese of Malacca-Johor, when Singapore ceased to be the Metropolitan See.

The Diocese of Kuala Lumpur was subsequently elevated, and it became the Metropolitan Archdiocese of Penang and Malacca-Johor until today.

In 1976, Penang hosted the Aggiornamento for all bishops and priests in West Malaysia.

[2] He was ordained on 20 August 2012, at St. Anne's Church in Bukit Mertajam, Penang, and installed in September 2012 at the Holy Spirit Cathedral in Gelugor.

In the 1970s, the administration of College General, Peninsular Malaysia's sole Catholic seminary, was handed over to the local clergy.

In 2001, the main administration centre of the diocese Pusat Keuskupan Katolik was opened by Bishop Antony.

The following year in 2002, the third St Anne's Church, Bukit Mertajam together with the parish centre, domus and administration office, were opened on the Feast of St Anne (26 July) by the then Apostolic Delegate.

Peninsular Malaysia's sole Catholic seminary, College General is located in Tanjung Bungah, Penang.