Goodthink, a term from Nineteen Eighty-Four by George Orwell, is a Newspeak word signifying a set of thoughts and beliefs that is in accordance with those established by the Party.

In the rules of Newspeak the noun stem (which also serves as a verb) can become the adjective goodthinkful, the adverb goodthinkwise, the past participle goodthinked, and the gerund goodthinking. Additionally, one who is "goodthinkful" is referred to as a goodthinker.