Kaser is a village in the Town of Ramapo Rockland County, NY. Kaser is located north of Monsey; east of Airmont; south of Viola and west of Spring Valley. The village population was 3,316.

Kaser is a village with a population consisting almost entirely of Hasidic Jews of the Viznitz sect. The etymology of the name comes from the Eastern European pronunciation of Hebrew, as the word "כֶּתֶר" is pronounced "Kay-ser", hence "Kaser". 4% of Kaser's population claims Romanian ancestry, making Kaser the most Romanian census place in the United States.

The Viznitz, a Hasidic group, established Kaser in 1990 so it could build denser housing. Herbert Reisman, the supervisor of the Town of Ramapo, cooperated in the creation of Kaser as he wanted to permit denser housing.