HTH-01-015 is a potent and selective inhibitor of NUAK1 (IC50 = 100 nM) and does not affect the activity of a panel of 139 other kinases, including additional AMPK family members. The administration of HTH-01-015 to MEFs (mouse embryonic fibroblasts) significantly inhibits migration in a wound-healing assay to a similar extent as NUAK1-knockout. HTH-01-015 also inhibit proliferation of MEFs to the same extent as NUAK1 knockout and U2OS cells to the same extent as NUAK1 shRNA knockdown. HTH-01-015 impaired the invasive potential of U2OS cells in a 3D cell invasion assay to the same extent as NUAK1 knockdown. HTH-01-015 will serve as useful chemical probes to delineate the biological roles of the NUAK kinases.