Hélène Guisan-Démétriadès (née Démétriadès, born 16 November 1916) is a Swiss Vaud writer, poet and teacher.
Guisan-Démétriadès was born in Istanbul, Ottoman Empire on 16 November 1916.
After studying literature and years of teaching Ancient Greek, she married the Vaud councilor Louis Guisan [fr].
She translated Greek tragedies into French and wrote many articles of spiritual reflection.
She is also the author of La Tierce présence a work which was awarded the Prix Ève Delacroix of the Académie française in 1995.