1A or 1-A may refer to:

Arts and entertainment

• 1A (comics), a comic book robot
• 1A (radio program), an American radio program

Politics

• All pages with titles containing California Proposition 1A
• First Amendment (disambiguation), the first amendment of various legislation

Science 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 vasopressin

Sports

• Croatian 1A Volleyball League
• 1. A SKL, the 2002–2006 name of Premier A Slovenian Basketball League

Transportation, 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 1A

See also

• All pages with titles containing 1A
• A1 (disambiguation)
• IA (disambiguation)