Guiscard (disambiguation)

Guiscard or de Guiscard may refer to:
 * Guiscard, commune in the Oise department in northern France

People with the name

 * Antoine de Guiscard (1658–1711), French refugee, spy and double
 * Catherine de Guiscard (1688–1723), daughter of the Marquis Louis de Guiscard
 * Robert Guiscard (c. 1015 – 1085), Norman adventurer
 * Roger Guiscard (1031–1101), Norman nobleman who became the first Count of Sicily from 1071 to 1101