Giselbert I ({{Lang-ca|Guislabert}}) (died 1013 or 1014), count of Roussillon (991–1013), was the son of Gausfred I. His father divided his lands between his sons, giving Ampurias to Hugh and Roussillon to Giselbert.

Though the patrimony was divided, both brothers continued to claim and annex territory belonging to the other and war was common, even among their descendants.

In 1013, Giselbert died and Hugh invaded his county. It was not until 1020 that Hugh was repelled and Gausfred, Giselbert's son, definitively succeeded.

By marriage to Beliarda, he produced three sons:

• Gausfred (died 1074), successor
• Sunifred (died 1031), bishop of Elna
• Berengar (died 1053), bishop of Elna

• The Folly of King Alfred the Great
• The Folly Tower
• The Fon of Batibo
• The Food and Agriculture Organization of the United Nations
• The Food and Environment Research Agency
• The food babe
• The Food babe
• The Food Babe
• The Food Gamblers
• The Food Inspectors
• The Food Network Star
• The Food Network Star (season 4)
• The Food Network Star (season 5)
• The Food Network Star (season 6)
• The Food of Italy
• The Food of the Gods
• The Food Trust
• The Food Wars
• The Food Wife
• The Fool (2013 film)
• The Fool (2014 film)
• The Fool (album)
• The Fool and the Princess
• The Fool (Edward Bond play)
• The Fool (EP)