Counted among the most imposing buildings of Singapore, Sultan Mosque, Singapore is located on the Muscat Street, in the Kampong Gelam (link to Kampong Gelam, Singapore) district. Sultan Mosque is regarded as the most important place of worship (link to Singapore Places of Worship) for the followers of Islam in Singapore.

Sultan Mosque, Singapore is the second sultan mosque to be erected on that site. The first mosque dates back to 1826. A part of the total cost of building the mosque was borne by the East India Company as was mentioned in the Company's agreement with Sultan Hussein. The present Sultan Mosque, Singapore was built in 1928 and was funded by the local Muslim community. The construction of the mosque was commissioned to the Irish architect known as Denis Santry. The architecture is a fusion of the classical Persian, Moorish and the Turkish. The domes have a characteristic Saracenic look. The crescent moons and the stars that feature commonly in Muslim architecture are present and accentuated by the mughal cupolas.

The chief prayer hall of the sultan Mosque, Singapore is a spacious one and fully carpeted at that. It can hold 5000 worshippers at a time. The hall is girdled by arcades and the Minbar or the pulpit is simply gorgeous. There are innumerable digital clocks in the mosque to maintain the prayer timings. Green and gold mosaic tiles adorn the walls of the prayer hall. The mosque also contains the tomb of Sultan Ali, the grandson of Sultan Hussein, the signatory of the treaty with East India Company.

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