C2H2O2

The molecular formula C2H2O2 may refer to:


 * Acetylenediol, or ethynediol: Ethyne-1,2-diol.svg
 * Glyoxal: Structural_formula_of_glyoxal.svg
 * Acetolactone: [[Image:Acetolactone-2D.png|frameless|upright=0.148|alt=H2C(O)CO]]