| Triplicane Big Mosque | |
|---|---|
Wallajah Mosque | |
 A panoramic view of Biq Mosque; Dome, water tank and the two minarets | |
| Religion | |
| Affiliation | Islam |
| Location | |
| Location | Triplicane, Chennai, Tamil Nadu, India |
  Location in Tamil Nadu, India | |
| Administration | Arcot Endowments Trust |
| Geographic coordinates | 13°04′N 80°16′E / 13.06°N 80.27°E |
| Architecture | |
| Type | Mosque |
| Style | Mughal |
| Completed | 1795 |
| Specifications | |
| Dome(s) | 2 (gold plated) |
| Minaret(s) | 2 |
| Minaret height | 131 ft (40 m) (tallest) |
Triplicane Big Mosque (also called Wallajah Mosque) is a mosque located in Triplicane High Road, Triplicane in Chennai, the capital of the South Indian state of Tamil Nadu. Constructed in the Mughal architectural style, the mosque was built in 1795 by the family of Muhammad Ali Khan Wallajah, the Nawab of Arcot during 1765. It has a large prayer hall, a tank and a large ground in front. The entire structure is constructed with granite without the use of iron or wood.
The Nawab of Arcot was friendly towards fellow Hindus, appointing a Hindu as his chief personal secretary. A chronogram written in Persian by Raja Makhhan Lal Bahdur Khirat, the Hindu Munshi of the Nawab, is found on the entrance to the prayer hall. The mosque is the largest and one of the oldest in Chennai and is active as a place of worship. It is administered by Prince of Arcot Endowments Trust. Most of the administrative staff of the mosque are Hindus, symbolizing peaceful coexistence between the two religions.