Possess, also known as Attach, may refer to:
- The command from Final Fantasy VI.
- The enemy ability from Final Fantasy V.
- The enemy ability from Final Fantasy VII.
- The enemy ability from Final Fantasy Mystic Quest.
- The enemy ability from Bravely Second: End Layer.
Spirit possession is a paranormal or supernatural event in which it is said that animas, demons, extra-terrestrials, gods, spirits, or other disincarnate entities take control of a human body, resulting in noticeable changes in health and/or behavior.