Ownership is the state or fact of exclusive rights and control over property, which may be an object, land/real estate or intellectual property. An ownership right is also referred to as title.

Ownership is the key building block in the development of the capitalist socio-economic system. The concept of ownership has existed for thousands of years and in all cultures. Over the millennia, however, and across cultures what is considered eligible to be property and how that property is regarded culturally is very different. Ownership is the basis for many other concepts that form the foundations of ancient and modern societies such as money, trade, debt, bankruptcy, the criminality of theft and private vs. public property.

The process and mechanics of ownership are fairly complex since one can gain, transfer and lose ownership of property in a number of ways. To acquire property one can purchase it with money, trade it for other property, receive it as a gift, steal it, find it, make it or homestead it. One can transfer or lose ownership of property by selling it for money, exchanging it for other property, giving it as a gift, being robbed of it, misplacing it, or having it stripped from one's ownership through legal means such as eviction, foreclosure and seizure. Ownership is self-propagating in that if an object is owned by someone, any additional goods produced by using that object will also be owned by the same person.

In person

Individuals may own property directly. In some societies only adult men may own property; in other societies (such as the Haudenosaunee), property is matrilinear and passed on from mother to the son. In most societies both men and women can own property with no restrictions and limitations at all.

Structured Ownership Entities

Throughout history, nations (or governments) and religions have owned property. These entities exist primarily for other purposes than to own or operate property, hence they may have no clear rules regarding the disposition of their property.

To own and operate property, structures (often known today as legal entities) have been created in many societies throughout history. The differences in how they deal with members' rights is a key factor in determining their type. Each type has advantages and disadvantages derived from their means of recognizing or disregarding (rewarding or not), contributions of financial capital or personal effort.

Cooperatives, corporations, trusts, partnerships, condominium associations are only some of the many varied types of structured ownership; each type has many subtypes. Legal advantages or restrictions on various types of structured ownership have existed in many societies past and present. To govern how assets are to be used, shared or treated, rules and regulations may be legally imposed or internally adopted or decreed.

Liability for the Group or for Others in the Group

Ownership implies responsibility, for actions regarding the property. A "legal shield" is said to exist if the entity's legal liabilities do not get redistributed among the entity's owners or members. An application of this, to limit ownership risks, is to form a new entity to purchase, own and operate each property. Since the entity is separate and distinct from others, if a problem occurs which leads to a massive liability, the individual is protected from losing more than the value of that one property. Many other properties are protected, when owned by other distinct entities.