Cathedral of the Immaculate Conception of the Blessed Virgin Mary, Roman Catholic cathedral in Medan, Indonesia

The Immaculate Conception of Mary Cathedral in Medan is a religious building with stone walls, a metal roof, and a single tower in Modernist style. The structure combines modern architectural principles with classic Catholic church elements, creating a balanced design in tropical surroundings.

The structure started in 1879 as a simple hut with a leaf roof serving the local community of Tamil Indians and Dutch settlers. It gradually developed and took its present form in 1928 after a major reconstruction.

The cathedral's full title, Gereja Katedral Santa Perawan Maria yang Dikandung Tanpa Noda, refers to the Immaculate Conception of Mary. Its congregation began with Tamil Indian and Dutch Catholics, and Tamil families later built St. Anthony's Church at Jalan Hayam Wuruk, with homes known in Tamil as Kovil Kambam. Masses are also held on Chinese New Year.

The cathedral stands at Jl Pemuda No 1, a street known in colonial times as Paleisstraat or Istana Street. Daily Mass is held at 06.00 WIB, with additional Saturday and Sunday services; visitors should avoid entering during these. The pastor's residence, built in wood in 1906 and rebuilt in 1964-1965, sits to the right of the church.

The 1928 expansion by Han Groenewegen added the choir, confessional rooms, front courtyard and tower to the 1905 stone church. The parish began in 1879 as a thatched hut on Jalan Pemuda, then called Istana Street, and its congregation was largely Tamil Indian and Dutch.