Ista

Ista may refer to:
 * Ernest Ista (1877–unknown), Belgian sports shooter, competitor at the 1908 Summer Olympics
 * Kevyn Ista (born 1984), Belgian road bicycle racer
 * Instituto Santo Tomás de Aquino (fundação 1987), Faculdade de Teologia e Filosofia, Belo Horizonte, Minas Gerais, Brasil.
 * -ista (suffix), a suffix used in Romance languages and occasionally in English
 * Ista (Bangladesh), a place in the Jessore District, Khulna Division of Bangladesh
 * the heroine of Paladin of Souls, a novel by Lois McMaster Bujold

ISTA or Ista may also refer to:
 * Institute of Science and Technology Austria, a research institution in Austria
 * International Safe Transit Association, a global organization that writes test procedures for performance package testing
 * International School of Temple Arts, an organization promoting alternative sex practices based on Western readings of tantra and shamanism
 * International School of Theatre Anthropology (since 1979), based in the Odin Teatret, Denmark
 * Internet Sacred Text Archive (since 1999), archive of cultural public domain texts
 * Indiana State Teachers Association, in Indiana
 * International Schools Theatre Association, based in the UK, networked in schools such as The British School, New Delhi or Koç School
 * International Society for Technology Assessment, related to Bryan Jennett, Fred Polak
 * Ista Pharmaceuticals or ISTA Pharmaceuticals, related to Calvin A. Grant, Hyaluronidase
 * International School of Traditional Aikido an Aikido organisation founded in France.
 * International Seed Testing Association, an international non-profit seed testing organization