Al-Manan Grand Mosque, also known as Agung Al-Mannan, is a mosque located in Dumai City, Indonesia. The mosque was built in 2000 and completed in 2002. The front view of the mosque features two tiered dome consisting of one main dome on the roof of the building and a smaller diameter dome on the entrance patio. This shape is reminiscent of the shape of the mosque in Kelantan, Malaysia. In addition to these two domes, there are also two domes that are placed on the right and left of the building. In the four corners of the main dome there is a towering tower (minarets) that adds a magnificent impression to the whole mosque.

The dominance of light blue throughout the body of the building and the blue-green accents on the dome give a cool impression in the midst of the hot weather in Dumai. The presence of small gardens in the front, side, and back yards of the mosque adds to the natural beauty of Al-Mannan Grand Mosque.

Entering the interior of the mosque, a modest impression is seen that is reinforced by the use of light blue without many ornamental details and the shape of the doors and window openings that tend to be minimalist. Moreover, the minimalist appearance in the main room makes the mihrab decorated with calligraphy paintings and a carved wooden pulpit a visual aspect that is quite prominent.  The colorful calligraphy paintings were made by the same calligrapher as the Great Mosque of An-Nur, Pekanbaru, Riau. Al-Mannan Grand Mosque remains a religious icon of Dumai City. This mosque is often crowded with people in various religious and social activities.