Melissic acid (or triacontanoic acid) is the organic compound with the formula CH<sub>3</sub>(CH<sub>2</sub>)<sub>28</sub>CO<sub>2</sub>H. It is classified as a very long chain fatty acid, a subset of saturated fatty acids. It is a white solid that is soluble in organic solvents. Melissic acid gets its name from the Greek word melissa meaning bee, since it was found in beeswax.
n-Triacontanoic acid was synthesized by Bleyberg and Ulrich (1931) and by G.M. Robinson.
Triacontanoic acid and triacontanamide (CH<sub>3</sub>(CH<sub>2</sub>)<sub>28</sub>-CONH<sub>2</sub>) can be self-assembled.