Triolein (glyceryl trioleate) is a symmetrical triglyceride derived from glycerol and three units of the unsaturated fatty acid oleic acid.

Most triglycerides are unsymmetrical, being derived from mixtures of fatty acids.

Triolein represents 4–30% of olive oil.

[1] Triolein is also known as glyceryl trioleate and is one of the two components of Lorenzo's oil.

[2] The oxidation of triolein is according to the formula: This gives a respiratory quotient of 57/80 or 0.7125.