Jessica Wittner (born 1983) is a Commander in the United States Navy and NASA astronaut.

[1] Wittner is a native of California with a distinguished career serving on active duty as a naval aviator and test pilot.

As a teenager she joined the Naval Sea Cadet Corps, where she attained the highest rank, Chief Petty Officer.

Wittner was commissioned as a naval officer through an enlisted-to-officer program and has served operationally flying F/A-18 fighter jets with Strike Fighter Squadron 34 in Virginia Beach, Virginia, and Strike Fighter Squadron 151 in Lemoore, California.

[3] In 2023, Wittner participated in the ESA PANGAEA training organized by the European Space Agency, held between Italy (Bletterbach canyon), Germany (Noerdlingen-Ries crater) and Spain (Lanzarote Island)[4][5][6] together with the colleagues Thomas Pesquet and Takuya Onishi.