初代サリー伯、ルイス領主およびヴァレンヌ領主ウィリアム・ド・ワーレン(William de Warenne, 1st Earl of Surrey, 1035年頃 - 1088年6月24日)は、ノルマン貴族。ウィリアム2世によりサリー伯に叙せられた。1066年のヘイスティングズの戦いにおいてウィリアム征服王の下で戦ったことが文書で確認できる数少ない人物の一人。1086年のドゥームズデイ・ブックの時点では、13州に広大な領地を所有しており、その中にはルイス領(現在、イースト・サセックスとウェスト・サセックスに分割されている地域)も含まれていた。
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