Isabel da Costa Ferreira, also Isabel Ruak Ferreira (born April 15, 1974 in Same, Portuguese Timor) is an East Timorese jurist, human rights activist, politician, former First Lady of East Timor from 2012 until 2017, and wife of East Timor's former president, Taur Matan Ruak.
Along with her husband, she is a member of Partidu Libertasaun Popular (PLP).