Tiruchirappalli (Tamil: தி௫ச்சிராப்பள்ளி (tiruccirāppaḷḷi) pronunciation (spelt as Trichinopoly in the records of British India), also called Tiruchi or Trichy (Tamil: தி௫ச்சி), is a city in the Indian state of Tamil Nadu. It is a municipal corporation and today the second capital and the fourth largest city and urban agglomeration in Tamil Nadu in terms of population. It is known as energy equipments fabrication capital of India. The estimated population of the urban agglomeration is 1,139,534 (as of 2009). It is situated in the centre of Tamil Nadu. It is the administrative headquarters of Tiruchirapalli District.

.The most famous landmark of Trichy is the Rockfort temple which is perched on a huge rocky out crop. The smooth crop was first hewn by the Pallavas but it was the Nayaks of Madurai who later built the Rock fort temple. The temple is dedicated to Lord Shiva and Lord Ganesha.

Trichy city encompasses Srirangam, a Vaishnavite temple and the biggest functioning Hindu temple in the world. Trichy also contains "ThiruAnaikka" (ThiruvAnaikkaval), House of Water, one of the five main abodes ("Panchaboodha Sthalam") of Lord Shiva. Chandrasekhara Venkata Raman was born in Thiruvanaikaval and his house has been preserved as a museum. Trichy is also called as Rock City.