Thanjavur district is one of the 38 districts of the state of Tamil Nadu, in southeastern India. Its headquarters is Thanjavur (Tanjore). The district is located in the delta of the Cauvery River and is mostly agrarian.

Thanjavur, also known as Thanjai, previously known as Tanjore, is a city in the Indian state of Tamil Nadu. It is the 11th biggest city in Tamil Nadu. Thanjavur is an important center of southern Indian religion, art, and architecture. Most of the Great Living Chola Temples, which are UNESCO World Heritage Monuments, are located in and around Thanjavur. The foremost among these, the Brihadeeswara Temple, built by the Chola emperor Rajaraja I, is located in the centre of the city. This temple has one of the largest bull statue in India carved out of a single granite rock called Nandi. Thanjavur is also home to Tanjore painting, a painting style unique to the region. Thanjavur is the headquarters of the Thanjavur District. The city is an important agricultural centre located in the Kaveri Delta and is known as the Rice bowl of Tamil Nadu. Thanjavur is administered by a municipal corporation covering an area of 36.31 km2 (14.02 sq mi) and had a population of 222,943. Roadways are the major means of transportation, while the city also has rail connectivity. The nearest airport is Tiruchirapalli International Airport, located 59.6 km (37.0 mi) away from the city. The nearest seaport is Karaikal, which is 94 km (58 mi) away from Thanjavur. The city first rose to prominence during the reign of the Cholas when it served as the capital of the empire. After the fall of the Cholas, the city was ruled by various dynasties such as the Mutharaiyar dynasty, the Pandyas, the Vijayanagar Empire, the Madurai Nayaks, the Thanjavur Nayaks, the Thanjavur Marathas and the British Empire. It has been a part of independent India since 1947.