Arts and entertainment
* 1A (comics), a comic book robot * 1A (radio program), ''1A'' (radio program), an American radio programPolitics
* * First Amendment (disambiguation), the first amendment of various legislationScience and technology
* Group 1A, an obsolete designation for the group 1 elements * AMY1A, a human gene * Alpha-1A adrenergic receptor, a human gene * Interferon beta-1a, a drug * Meltwater pulse 1A, a period of rapid post-glacial sea level rise, 13,500–14,700 years ago * Melatonin receptor 1A, a human gene * Metallothionein 1A, a human gene * MH-1A, a nuclear power reactor and the first floating nuclear power station * Vasopressin receptor 1A, a major receptor type for vasopressinSports
* Croatian 1A Volleyball League * 1. A SKL, the 2002–2006 name of Premier A Slovenian Basketball LeagueTransportation, military and space
* Adcox 1-A, an American 1929 biplane * Astra 1A, a 1988 satellite * Class 1-A, an American military service classification * Little Joe 1A, a 1959 unmanned NASA launch * Mercury-Redstone 1A, a 1969 NASA mission * Packard 1A-1500, a 1929 piston aircraft engine * Shin Meiwa US-1A, a Japanese anti-submarine warfare aircraft * Sisu 1A, an American 1950s sailplane * Türksat 1A, a Turkish satellite * List of highways numbered 1ASee also
* * A1 (disambiguation) * IA (disambiguation) {{Letter-NumberCombDisambig