Tiana Alexandra-Silliphant (Thi Thanh Nga; August 11, 1956) is a Vietnamese-American actress and filmmaker. Her award-winning 1992 film From Hollywood to Hanoi was the first American documentary feature film shot in Vietnam by a Vietnamese-American. It was shown at film festivals and movie theaters across the U.S. and highlighted the plight of Amerasians, as well as the devastating effects of Agent Orange.

Alexandra starred opposite actors Robert Duvall, James Caan and Rod Steiger in feature films such as Sam Peckinpah's The Killer Elite, and Catch The Heat. She also starred in the made-for-television features Pearl and Fly Away Home, written by her husband Stirling Silliphant. Alexandra was Associate Producer on David Cronenberg's 2011 feature film A Dangerous Method.

Alexandra's film The General & Me (in post production as of April 2015) focuses on her 25-year relationship with General Võ Nguyên Giáp, Ho Chi Minh's trusted military strategist during the Indochina and Vietnam Wars.