Ivy Julia Cromartie Stranahan (1881–1971) was an American philanthropist heavily involved with the Seminoles of Southern Florida.
She trained as a teacher initially, but after marrying Frank Stranahan, she settled permanently in Fort Lauderdale.
While there, she began supporting the rights of the Seminoles and aiding them in moving to an Indian reservation.
She is closely associated with the Friends of the Florida Seminoles, an organisation through which she sought to support the education of Seminole children, build homes and eventually to support themselves fully.