Tatyana Ivanovna Ustinova (November 14, 1913, Alushta — September 4, 2009, Vancouver) was a Soviet geologist, who discovered Valley of Geysers in Kamchatka.
Tatyana Ustinova graduated from Kharkiv University and subsequently worked on projects in the Ural Mountains and Reserve Ilmen.
In April 1941, while accompanied by the Itelmen guide Anysyfor Pavlovich Krupenin, she found the Valley of Geysers.
In 1989, Ustinova left her homeland to live in Canada along with her eldest daughter, Tatyana, and she died there on September 4, 2009.
Following Ustinova's testament, her ashes were buried in Valley of Geysers on August 5, 2010, 11 months and 2 days after her death.