Recently, cellulose nanofibers (CNFs) have attracted attention because of their potential as building blocks in materials science. Their production, however, is often seen as inefficient and the tuning of their properties is not straightforward. Contrary to exploiting costly and environmentally taxing delignified wood pulp as a raw material, this study demonstrates CNF production using agricultural waste: potato fibers. The process for obtaining typical long (μm scale) CNFs involved alkali treatment, NaClO