All monsters belong to a monster class, based on the default ASCII monster symbol that represents them. For some classes, the symbol is almost all that unites them; for instance, x or w. Other symbols represent monsters that share much in common, such as D or K. Additionally, some classes have individual members that are in many ways an "odd one out", such as E stalkers and e gas spores.

Current classes are as follows. Names are as provided by the NetHack what is command.

Community content is available under CC-BY-SA unless otherwise noted.