The Cathedral of the Holy Immaculate Conception is a Roman Catholic church in Johor Bahru, Malaysia. It is the oldest church in Johor Bahru, built in 1927 by the late Rev. Fr. C. Saleilles, M. AP. The original church was built in 1883 and was dedicated to Our Lady of Lourdes. The cathedral is an active centre of Catholic life and prayer in the heart of Johor Bahru City. The Roman Catholic priests continue their tradition of preaching, personal instruction, sacramental life and pastoral care extending well beyond the geographical boundaries of Johor Bahru.