Octadecadienoic acid may refer to:
Conjugated linoleic acids Linoleic acid, (9Z,12Z)-9,12-octadecadienoic acid Linolelaidic acid, (9E,12E)-9,12-octadecadienoic acid Rumenic acid, (9Z,11E)-9,11-octadecadienoic acid Taxoleic acid, (5Z,9Z)-5,9-octadecadienoic acid Laballenic acid, 5,6-octadecadienoic acid