Melesina Trench (née Chenevix, previously St George; 22 March 1768 – 27 May 1827) was an Irish writer, poet and diarist.

During her lifetime she was known more for her beauty than her writing, and it wasn't until her son, Richard Chenevix Trench, published her diaries posthumously in 1861 that her work received notice.

Her husband died only four years later in Portugal[2][self-published source], leaving one son, Charles Manners St George, who became a diplomat.

It was during these travels that she met Lord Nelson, Lady Hamilton and the cream of European society, including Rivarol, Lucien Bonaparte, and John Quincy Adams while living in Germany.

Another oil painting, The Evening Star by Sir Thomas Lawrence, had her as a subject, and she was reproduced in portrait miniatures; one in Paris by Jean-Baptiste Isabey and another by Hamilton that was copied by the engraver Francis Engleheart.