Who can sue for defamation? Under the Defamation Act 2005, the following can be a plaintiff: A person; or A corporation (that is not a public entity), if it is either: a not for profit organisation; or it employs fewer than 10 people and is not related to another corporation. A corporation that does not fit within the point above cannot sue for defamation under the Defamation Act 2005. This limitation was introduced in response to community concern that large corporations were able to use a threat of defamation to suppress legitimate public criticism and debate. Does this mean that a company which employs more than 10 people can not sue for defamation when publicly criticize its behavior?