Kalyan (Pronunciation: [kəljaːɳ]) is a city on the banks of Ulhas River in Thane district of Maharashtra state in Konkan division.

Kalyan and its neighbouring township of Dombivli jointly form Kalyan-Dombivli Municipal Corporation, abbreviated as KDMC.

Kalyan also serves as a major railway station for the trains bound to Mumbai and is a large junction separating two routes, one going Karjat and other Kasara.

In Colonial India, the British Raj called the city Kallian, Cullian, or Calliannee.

The cast iron mileposts that existed in and around Kalyan had the spelling Callian as the name for the town and were installed during the colonial times.

The wall of the fort along the top of the inner bank of the ditch, and, near the north end, had a gateway known as the Delhi or Killyacha Darwaja.

It was then one of the largest urban local bodies in Mumbai Metropolitan Region (MMR) and in the state, with an area around 209 km2 (81 sq mi).

[clarification needed] Presently the total area of the corporation has remained, and measures about 67 km2 (26 sq mi).

Due to its highly educated population it is often called the second cultural capital of Maharashtra after Pune.