Octaethylporphyrin (H2OEP) is an organic compound that is a relative of naturally occurring heme pigments.

The compound is used in the preparation of models for the prosthetic group in heme proteins.

As its conjugate base OEP2-, it forms a range of transition metal porphyrin complexes.

When treated with ferric chloride in hot acetic acid solution, it gives the square pyramidal complex Fe(OEP)Cl.

In contrast to tetraphenylporphyrin and related analogues, H2OEP features unprotected meso positions.