Hassler, Hasler or Hašler may refer to:
Hassler, a German surname and its variants Hasler AG a Swiss telecommunications company Asteroid 37939 Hašler Hasler Hundred, former hundred in the county of Dorset, England Hasler Series, British national club championship in the sport of marathon canoeing Hassler (vessel), 1870 iron-hulled steamship NOAAS Ferdinand R. Hassler (S 250), 2009 coastal mapping ship