Subject

• Subject (school), a course of academic instruction

• Subject (documents) (subject classification; subject indexing; subject searching)
• Subject term or index term, descriptor of a document used in bibliographic records

• Subject (philosophy), a being that has subjective experiences, subjective consciousness, or a relationship with another entity
• Subject–object problem, the issue of how actors or observers relate to things that are observed or acted upon

• In general, any topic currently under consideration; see subject (school)
• Subject (grammar), who or what a sentence or a clause is about
• Subject case or nominative case, one of the grammatical cases for a noun

• Subjects (programming), core elements in the subject-oriented programming paradigm

• The melodic material presented first in a fugue
• Either of the two main groups of themes (first subject, second subject) in sonata form

A subject is an individual subjected to the rule by an elite, see feudalism

• subjects in medieval feudalism, see commoners
• subjects in modern constitutional monarchies, such as the United Kingdom, see British subject

• A subject is someone or something that undergoes testing in a scientific experiment.