Great Mosque of Medan, Grand mosque in Medan, Indonesia

The Great Mosque of Medan stands in the city center and shows an eight-sided base with four wings extending toward north, south, east, and west. The central dome is surrounded by several smaller domes that give the building a multi-layered silhouette.

Sultan Ma'mun Al Rashid of the Deli Sultanate began the mosque on 21 August 1906 (1 Rajab 1324 AH), with the first Friday prayer marking completion on 10 September 1909. The one-million-guilder cost was shared by the sultanate, the Deli Maatschappij and Medan businessman Tjong A Fie. The Dutch architect Theodoor van Erp drew the first plans before handing the work to JA Tingdeman.

The mosque takes its name from Sultan Ma'mun Al Rashid's title Al-Mashun. Its construction was funded by the Deli Sultanate, the Deli Maatschappij and the Chinese businessman Tjong A Fie, the wealthiest merchant in Medan at the time. The stained glass in the windows survives from the Art Nouveau period of 1890–1914, combined with Islamic ornament, and the carved floral motifs cover walls, ceilings, pillars and arches.

The building offers space for around 2000 worshippers and has several entrances at the corners that ease access from all sides. Visitors should wear modest clothing and be mindful of prayer times to avoid disrupting the flow.

The interior spaces display Italian marble floors, French crystal chandeliers, and stained glass windows from the art nouveau period. These materials were imported from Europe during the colonial era and lend the building an unusual character.