Sakiko Yamaoka (山岡 さ希子; born 1961) is a Japanese performance artist from Tokyo, Japan.

Since the early 1990s, she has staged performances in various cities across Asia, Europe, and both Americas.

[3] In her performance art, Yamaoaka focuses on how we see objects and things, and on human boundaries.

"[4] Since the early 1990s, Yamaoka has staged performance exhibitions in Japan and abroad at art festivals and other events as well as in urban environments.

[6] In the 29-minute-long film Phenomenology of Truth, she portrays a Japanese artist who one day gets to meet a Warsaw philosopher - whom she has admired at a distance.