Marie Carolle Lise de Ste-Croix (born November 28, 1968) is a Canadian educator, researcher and former political figure in New Brunswick.
She represented Dalhousie-Restigouche East in the Legislative Assembly of New Brunswick from 1995 to 1999 as a Liberal member.
She was born in Dalhousie, New Brunswick and graduated from Mount Allison University in 1990 with a Bachelor of Arts in Canadian Studies.
De Ste-Croix was a teacher and French instructor in Iqaluit.
Since September 2006, she has worked as Director of Alumni and Development for Mount Allison University.