Ethanolamine, also called 2-Aminoethanol or Monoethanolamine (often abbreviated as MEA), is an organic chemical compound which is both a primary amine (due to an amino group in its molecule) and a primary alcohol (due to a hydroxyl group). Like other amines, monoethanolamine acts as a weak base. Ethanolamine is a toxic flammable corrosive colorless viscous liquid with an odor similar to ammonia.

Ethanolamine is commonly called monoethanolamine or MEA to distinguish it from diethanolamine (DEA) and triethanolamine (TEA). Monoethanolamine is produced by reacting ethylene oxide with ammonia. Further treatment with ethylene oxide can yield DEA and/or TEA. Ethanolamine is the second most abundant head group for phospholipids.