Portrait of Harriet Mellon is a c.1815 portrait painting of the Irish actress Harriet Mellon by the English artist Sir William Beechey.

[3] She married twice first to the financier Thomas Coutts who left her control of the bank Coutts on hia death and then became the Duchess of St Albans after marrying the Ninth Duke.

Extremely wealthy from her first marriage she was a prominent figures of society during the Regency era.

Beechey, a noted British portraitist, painted her five times.

This version likely shows Mellon in her wedding dress shortly after her March 1815 marriage to Coutts.