1H

100y or 1-H may refer to:

• Hydrogen (₁H), a chemical element
• 1H, a number of chemical compounds with one hydrogen atom
• Hydrogen-1 (¹H, or Protium), an isotope of hydrogen
• 1H, a grouping within an Astronomical catalog
  • 1H 1617-155, a designation for the Scorpius X-1 X-ray source
  • 1H 1908+047, a designation for the SS 433 star system
• Astra 1H, an SES satellite launched in 1999

• 1H, a model of Nissan H engine
• 1H NMR, a type of Proton NMR
• 1 H. Cas, a variant notation for AR Cassiopeiae
• UH-1H, a type of Bell UH-1 Iroquois
• Campath-1H, a brand of Alemtuzumab
• Ardiden 1H, a model of HAL/Turbomeca Shakti
• Blendkörper 1H, smoke grenade used by Germany in World War II
• SSH 1H, alternate name for Washington State Route 534
• 1H, one hour
• 1H Year, 1st half of year

• H1 (disambiguation)