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The Triplicane Big Mosque, also called the Wallajah Mosque, is a mosque and dargah complex on Triplicane High Road in the Triplicane neighbourhood of Chennai, Tamil Nadu, in South India. Built in the Mughal style, it has a large prayer hall, a water tank and a spacious courtyard. The whole structure is made of granite, with no iron or wood used in its construction. It is described as the largest and one of the oldest mosques in Chennai, and it remains an active place of worship. The complex is administered by the Prince of Arcot Endowments Trust. Most of its administrative staff are Hindus, which is regarded as a symbol of peaceful coexistence between the two communities.

The mosque was completed in 1795 by the family of Muhammad Ali Khan Wallajah, the Nawab of Arcot. At the entrance to the prayer hall is a Persian chronogram composed by Raja Makhhan Lal Bahadur Khirat, the Nawab's Hindu munshi. The Nawab is also recorded as having appointed a Hindu as his chief personal secretary.