Lady Florence Baker or Barbara Szász; Maria Freiin von Sass; Barbara Szasz; Barbara Maria Szász; Barbara Maria Szasz (August 6, 1841 – March 11, 1916) was an explorer who was born in Hungary. She became an orphan and was being sold as a slave when she came into the possession of Samuel White Baker. Together they went in search of the source of the River Nile and found Lake Albert. They returned to England where they were married and she became Lady Florence Baker.