Palashi or Plassey, pronounced [ˈpɔlaʃi], Hindustani pronunciation: [pəˈlaːʃi]) is a town on the east bank of Bhagirathi River, located approximately 50 kilometres north of the city of Krishnanagar in Kaliganj CD Block in the Nadia District of West Bengal, India.

It is particularly well known due to the Battle of Plassey fought there in June 1757, between the private army of the British East India Company and the army of Siraj-ud-Daulah, the Nawab of Bengal.

The name Palashi is derived from the Bengali word for the red-flowered tree পলাশ (ISO: palāś, English: Butea, Latin: Butea frondosa or Butea monosperma). The Bengali word is ultimately derived from Sanskrit: पलाश, romanized: palāśa. The British East India Company referred to it as ‘Plassey’.

Palashi achieved historical significance when, on 23 June 1757, the Battle of Plassey was fought between the forces of Siraj-ud-Daulah, the last reigning Nawab of Bengal (and his French support troops), and the troops of the British East India Company, led by Robert Clive. This event, part of the Seven Years' War, ultimately led to the establishment of British rule in Bengal and, eventually, the whole Indian subcontinent. During British rule Plassey became part of Nadia District of Bengal.

Palashi is located in the West Bengal state of India at 23°48′N 88°15′E / 23.80°N 88.25°E / 23.80; 88.25. It has an average elevation of 17 m (56 ft).

Nadia district is mostly alluvial plains lying to the east of Hooghly River, locally known as Bhagirathi. The alluvial plains are cut across by such distributaries as Jalangi, Churni and Ichhamati. With these rivers getting silted up, floods are a recurring feature. The Krishnanagar Sadar subdivision, presented in the map alongside, has the Bhagirathi on the west, with Purba Bardhaman district lying across the river. The long stretch along the Bhagirathi has many swamps. The area between the Bhagirathi and the Jalangi, which flows through the middle of the subdivision, is known as Kalantar, a low-lying tract of black clay soil. A big part of the subdivision forms the Krishnanagar-Santipur Plain, which occupies the central part of the district. The Jalangi, after flowing through the middle of the subdivision, turns right and joins the Bhagirathi. On the south-east, the Churni separates the Krishnanagar-Santipur Plain from the Ranaghat-Chakdaha Plain. The east forms the boundary with Bangladesh. The subdivision is moderately urbanized. 20.795% of the population lives in urban areas and 79.205% lives in rural areas.

Note: The map alongside presents some of the notable locations in the subdivision. All places marked in the map are linked in the larger full screen map. All the four subdivisions are presented with maps on the same scale – the size of the maps vary as per the area of the subdivision.

As per the 2011 Census of India, Palashi had a total population of 19,984, of which 10,288 (51%) were males and 9,696 (49%) were females. Population below 6 years was 2,700. The total number of literates in Palashi was 11,462 (66.32% of the population over 6 years).