Territorialism can refer to:

• Animal territorialism, the animal behavior of defending a geographical area from intruders
• Environmental territorialism, a stance toward threats posed toward individuals, communities or nations by environmental events and trends
• Jewish Territorialist Organization, a Jewish political movement in the early 20th century advocating settlement in a number of territories outside of the Holy Land as an alternative to Zionism
• Territorialist School, a contemporary Italian approach to urban and regional planning
• Land tenure, the legal regime in which land is owned by an individual
  • Feudalism, a legal and military system of hierarchical land holding
• Statism, the belief that the state should control economic or social policy, or both, to some degree
  • Statism in Shōwa Japan

• Territory (disambiguation)