Meriam Yehya Ibrahim, eight months pregnant and the mother of a 20-month-old child, was also convicted of adultery for marrying a non-Muslim man, and sentenced to flogging.
The judge ruled that she will die by hanging for renouncing the Muslim faith of her father. Ibrahim's father left his family when she was six years old, and Ibrahim was raised a Christian by her mother.
The U.S. Department of State denounced the court ruling, saying it was "deeply disturbed" by the harsh sentencing, and expressed hope for an appeal.
The U.S., British, Canadian, and Dutch embassies called on the Sudanese government "to respect the right to freedom of religion, a right enshrined in Sudan's own 2005 Interim Constitution as well as international human rights law."