Spiro Konstantine Kostof (7 May 1936, Istanbul – 7 December 1991, Berkeley) was a Turkish-born American leading architectural historian, and educator.
Born in Turkey, of Greek and Bulgarian ethnic origin, Kostof was educated at Istanbul's Robert College.
He received his Ph.D. in 1961, then taught at Yale for four years, before moving to the University of California, Berkeley, to join the faculty of the College of Environmental Design.
Kostof's textbook, A History of Architecture: Settings and Rituals (1985) embodied these ideas and soon became one of the standard texts in the field.
In 1993, following his death, the Society of Architectural Historians established the "Spiro Kostof Award", to recognize books "in the spirit of Kostof's writings," particularly those that are interdisciplinary and whose content focuses on urban development, the history of urban form, and/or the architecture of the built environment.