絕緣子(英語:insulator)是真核生物基因組的調控元件之一,亦為一種邊界元件。功能為阻止臨近調控元件,對它所界定基因的啟動子起增強或者阻遏的作用。它對增強子的抑制作用具有極性,即只對處於其所在邊界另一側的增強子有抑制作用,而並不能抑制與其處於同一結構域的增強子。

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