| Al-Kauthar Mosque | |
| Native Name: | Masjid Al-Kauthar |
| Native Name Lang: | ms |
| Map Type: | Malaysia Sabah |
| Map Size: | 220px |
| Coordinates: | 4.2433°N 117.8942°W |
| Religious Affiliation: | Islam |
| Location: | Tawau, Sabah, Malaysia |
| Tradition: | Sunni |
| Festivals: | --> |
| Organizational Status: | --> |
| Architecture Type: | mosque |
| Groundbreaking: | 1997 |
| Year Completed: | 2002 |
| Construction Cost: | RM31.5 million |
| Date Destroyed: | --> |
| Capacity: | 17,000 |
| Minaret Quantity: | 1 |
| Minaret Height: | 58 metres |
| Elevation Ft: | --> |
The Al-Kauthar Mosque (Malay: Masjid Al-Kauthar or also known as Masjid Besar Tawau) is a mosque in Tawau, Sabah, Malaysia.
Built in 1997 and completed in 2002, it is the largest mosque in the state of Sabah, with a capacity that can accommodate from 16,000 to 17,000 people.[1] The mosque was officially opened in 2004, officiated by the Yang di-Pertuan Agong at the time, Syed Sirajuddin Tuanku Syed Putra Jamalullail.[2]