East Fishkill is a town on the southern border of Dutchess County, New York, United States. The population was 29,029 at the 2010 census. The town was once the eastern portion of the town of Fishkill.

Hudson Valley Research Park (formerly known as IBM East Fishkill) is located in the town, and housed 27 divisions and 4,700 regular employees for IBM Microelectronics, that GlobalFoundries bought. While IBM produced microchips they owned the advanced, automated processor fabrication facility where IBM's "Cell" processor was co-developed.

One early settler arrived around 1759. The town of East Fishkill was established in 1849 from the eastern part of the town of Fishkill. The name "Fishkill" comes from that of the river which the Dutch settlers in the area called "Vis Kill" which means "fish creek".

According to the United States Census Bureau, the town has a total area of 57.4 square miles (148.6 km²), of which 56.5 square miles (146.3 km²) is land and 0.89 square miles (2.3 km²), or 1.54%, is water.

The south town line is the border of Putnam County.

Interstate 84 and the Appalachian Trail pass across the town. The Taconic State Parkway runs north-south as well.

As of the census of 2000, there were 25,589 people, 8,233 households, and 7,006 families residing in the town. The population density was 449.7 people per square mile (173.6/km²). There were 8,495 housing units at an average density of 149.3 per square mile (57.6/km²). The racial makeup of the town was 92.54% White, 2.29% African American, 0.15% Native American, 2.80% Asian, 0.02% Pacific Islander, 0.86% from other races, and 1.34% from two or more races. Hispanic or Latino of any race were 4.04% of the population.

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