Trespassing was the act of entering land or property owned by another without permission or other lawful reason to be there. One who commits this crime was known as a trespasser or intruder.
In 2257, Christopher Pike apologized to the inhabitants of Terralysium for trespassing in a church on their planet. (DIS: "New Eden")
In 2269, Flint claimed that James T. Kirk was trespassing on his planet. (TOS: "Requiem for Methuselah")
In 2366, Jean-Luc Picard termed the illegal colonists on the Sheliak world Tau Cygna V trespassers, as they were there in violation of the Treaty of Armens. (TNG: "The Ensigns of Command")
As of that same year the Sarthongians, according to Picard, were known for being ruthless towards trespassers. He informed Vash of this upon learning she wished to travel to the ruins of Sarthong V for an archaeology expedition. She did travel there and told Picard the following year that she obtained several impressive artifacts from the planet. (TNG: "Captain's Holiday", "Qpid")
In 3191, in the Federation Watch List for Moll, trespassing was listed with other crimes that she had committed during her career as a professional criminal. (DIS: "Mirrors")