Rahadyan Timoteo Sastrowardoyo (born March 31, 1963, in New York City) is a writer, editor and photographer.

Sastrowardoyo studied acting with Deborah Savadge beginning in the fall of 1989, ostensibly as a means to help him deal with his shyness.

He has also studied poetry with Kimiko Hahn, Richard Tayson and Li-Young Lee; performance with Beau Sia and the Asian American troupe Peeling; playwriting with Julia Cho and David Henry Hwang; photography with Charles Gatewood; dance with Ducky DooLittle and Pamardi Tjiptopradonggo; and writing with Rachel Kramer Bussel and Paul Levitz.

In the summer of 1990, Sastrowardoyo and some classmates from Deborah Savadge's acting class (directed by Guy Ventoliere) performed a series of one-act plays, originally performed by the Actors Theatre of Louisville, as a benefit for Coalition for the Homeless.

Sastrowardoyo gave a poetry reading at the Asian American Writers Workshop in January 2000.

He is also a cousin of Sunaryati Hartono (1931-2023) and Astrid Susanto (1936–2006), officials in the Indonesian government; and Marina Joesoef (b.

His paternal grandfather, Sutejo Sastrowardoyo (1878–1967), traced the family's ancestry back to 15th century Java.