A1C

A1C may refer to:

Biology and chemistry

 * Glycated hemoglobin (hemoglobin A1c or HbA1c), a surrogate marker for blood glucose levels
 * A1C receptor, the alpha-1C adrenergic receptor

Transportation and vehicles

 * Rivian A1C, a prototype CUV, predecessor of the Rivian R1S
 * MV (A1C) William H. Pitsenbarger, U.S. maritime sealift command container ship
 * NASA A1C spacesuit, an Apollo variant of the Gemini spacesuit

Other uses

 * Airman First Class, the third enlisted rank in the United States Air Force
 * A1C, a postal code in Downtown St. John's, Newfoundland Island, Newfoundland and Labrador, Canada