<small>L</small>-Fuculokinase () is an enzyme that catalyzes the chemical reaction
Thus, the two substrates of this enzyme are ATP and <small>L</small>-fuculose, whereas its two products are ADP and <small>L</small>-fuculose-1-phosphate.
The gene name used for the gene that encodes <small>L</small>-fuculokinase is fucK.
<small>L</small>-Fuculokinase belongs to the family of transferases, specifically those transferring phosphorus-containing groups (phosphotransferases) with an alcohol group as acceptor. The systematic name of this enzyme class is ATP:<small>L</small>-fuculose 1-phosphotransferase. Other names in common use include <small>L</small>-fuculokinase (phosphorylating), and <small>L</small>-fuculose kinase. This enzyme participates in fructose and mannose metabolism.