The law pertaining to trespass is covered under the Revised Statutes of Ontario (RSO), specifically R.S.O. 1990, CHAPTER T.21. Section 2, subsection 1 states that: Trespass an offence (1) Every person who is not acting under a right or authority conferred by law and who, (a) without the express permission of the occupier, the proof of which rests on the defendant, (i) enters on premises when entry is prohibited under this Act, or (ii) engages in an activity on premises when the activity is prohibited under this Act; or (b) does not leave the premises immediately after he or she is directed to do so by the occupier of the premises or a person authorized by the occupier, is guilty of an offence and on conviction is liable to a fine of not more than $2,000. R.S.O. 1990, c. T.21, s. 2 (1). Translation: You must be acting under a right or authority to be on the property (example: you have been given permission, caretaker, security, etc.). The burden of proof rests on you to prove that you have the permission of the property owner to be on his/her property. You could be found guilty of trespassing if you are inside a dwelling or involved in an activity on property (eg. camping or hunting). You could also be found guilty if you do not leave the premises when asked to do so by the occupier or someone authorized to speak for them. Example: If you are asked to leave property by a neighbor, and that neighbor has been given the authority to act on the behalf of the property owner, you are guilty of trespass if you refuse to leave.