Þóra Steinunn Steffensen (born 9 December 1962) is an Icelandic physician and forensic pathologist. She played basketball for the Íþróttafélag Reykjavíkur and the Íþróttafélag stúdenta and was for a time the tallest player in the women's top division as well as sitting on the board of the Icelandic Basketball Association.