Nancy Sandra Sinatra (born June 8, 1940) is an American singer and actress. She is the daughter of singer/actor Frank Sinatra, and is widely known for her 1966 signature hit "These Boots Are Made for Walkin'".

Other defining recordings include "Sugar Town", the 1967 number one "Somethin' Stupid" (a duet with her father), the title song from the James Bond film You Only Live Twice, several collaborations with Lee Hazlewood such as "Jackson", and her cover of Cher's "Bang Bang", which was used in the opening sequence of Quentin Tarantino's 2003 film Kill Bill: Vol. One.