Békesi, Békési, Békésy or Békesy or Bekessy is a surname, related to the area of the original castle Békés and its noble family, and the present town of the same name.
Notable people with the surname include: Eszter Békési (born 2002), Hungarian swimmer Georg von Békésy (1899–1972), born György Békésy, Hungarian biophysicist, awarded the 1961 Nobel Prize in Physiology or Medicine Ilona Békési (born 1953), retired Hungarian gymnast László Békesi (born 1942), Hungarian politician Sándor Békési (1928–1994), Hungarian gymnast Sarah Bekessy, Australian interdisciplinary conservation scientist Hans Habe, born János Békessy (1911–1977), a Hungarian and American writer and newspaper publisher. Gáspár Bekes (1520–1579), a Hungarian nobleman