Epithelial cells of the small intestine are the site of zinc absorption. Intestinal uptake of zinc is inversely proportional to the dietary supply of this essential micronutrient. The mechanism responsible for this adaptive differential in apical zinc transport is not known. The zinc transporter Zip4 (SLC39A4) is essential for adequate enteric zinc uptake. In mice Zip4 expression is up-regulated at low zinc intakes with a concomitant ZIP4 localization to the apical enterocyte plasma membrane. With the present experiments, we show that the zinc finger transcription factor, KLF4, produced in high abundance in the intestine, is expressed at elevated levels when low zinc diets are provided to mice. Using a murine intestinal epithelial cell (IEC) line (MODE-K), zinc depletion of culture medium with both cell-permeant and cell-impermeant chelators, produced increases in Zip4 and Klf4 mRNA and Zip4 heterogeneous nuclear RNA expression. Zinc depletion led to increased KLF4 in nuclear extracts. Knockdown of KLF4 using siRNA transfection drastically limited ZIP4 induction upon zinc depletion and reduced the uptake of ⁶⁵Zn by depleted IEC. Electrophroetic mobility shift assays with nuclear extracts of IEC showed KLF4 binding to cis-elements of the mouse Zip4 promoter with increased binding under zinc-limited conditions. Reporter constructs with the Zip4 promoter and mutation studies further demonstrated that Zip4 is regulated through a KLF4 response element. These data from experiments with mice and murine intestinal epithelial cells demonstrate that KLF4 is induced during zinc restriction and is a transcription factor involved in adaptive regulation of the zinc transporter ZIP4.