Diandra Paramitha Sastrowardoyo (born March 16, 1982 in Jakarta, Indonesia) -- more popularly known as Dian Sastro or Dian Sastrowardoyo -- is an Indonesian model and actress.

In 1996, she was the cover girl of Gadis, a teen magazine in Indonesia. She later became popular as Daya, the protagonist in Pasir Berbisik (Whispering Sand). Dian finally kick-started her career on the big screen with a cameo role in the highly popular Malay Film Puteri Gunung Ledang before quickly establishing herself as one of Indonesia's most influential actresses, starring in films such as Ada Apa Dengan Cinta (AADC) (What's Up With Love? (film)), Banyu Biru, Ungu Violet and Belahan Jiwa.

Her recent (as of March 2007) television appearances include playing Raya in Dunia Tanpa Koma and a brief stint as the host of the game show Kuis Super Milyarder Tiga Milyar.

Ms. Sastrowardoyo is the daughter and only child of the late Ariawan Sastrowardoyo (1955-1995) and Dewi Parwati Sastrowardoyo (née Setyorini). Her paternal grandparents are Dr. Sumarsono Sastrowardoyo, a retired physician and surgeon (and author of the memoir Kembali ke Uteran (Return to Uteran)), and the late Ina Sastrowardoyo.

She is the niece of Marina Joesoef, an artist; Dr. Aswin W. Sastrowardoyo, currently a physician and formerly guitarist and singer with Chaseiro, a music group of the 1970's and 80's; and Lisa Damayanti Sastrowardoyo. She is also the grand-niece of, among others, Sunario (1902-1997), Indonesia's minister of foreign affairs from 1953 to 1956; Dra. Sukanti Suryochondro, a former instructor in women's studies at the University of Indonesia; and Subagio Sastrowardoyo (1924-1995), a noted poet and literary critic.

A screenplay based on Kembali ke Uteran is in the works, with plans for Ms. Sastrowardoyo to play her own great-grandmother in the film adaptation.