CLK-1

CLK-1, clk1, or variation, may refer to:


 * USS Norfolk (CLK-1), post-World War II light cruiser reclassified as a destroyer leader (DL)
 * clk-1 (gene), the clock-1 gene for ubiquinone biosynthesis encoding DMQ hydroxylase
 * CLK1 (protein), the human enzyme dual specificity protein kinase CLK1, encoded by the CLK1 gene