Giselher, Gisilher, Gisiler, or Giseler () is a Germanic masculine given name. It may refer to:

• Giselher of Burgundy, Burgundian king

• Gisilher (archbishop of Magdeburg) (died 1004), German ecclesiastic

• Giselher Klebe (1925–2009), German composer

• Giselher Schubert (born 1944), German musicologist

• Giselher Wilke (1922–2007), German army officer

• Giselher Wirsing (1907–1975), right-wing German journalist, author, and foreign policy expert

See also

• Gislhere (died circa 785), English Bishop of Selsey

• Jan Jerzy Gisiler, 18th century Polish military officer