"For the past 50 days we've been disrupting and exposing corporations, governments, often the general population itself, and quite possibly everything in between, just because we could," the group said in a message uploaded to The Pirate Bay file sharing website.
"It is time to say bon voyage," the message concluded. "We must now sail into the distance."
The Lulz farewell contended that the group had a crew of six people and implied the plan from the outset was for the hacking campaign to last 50 days.
While it remained to be seen whether members of the group would truly stop bedeviling the Internet, it was unlikely police would abandon efforts to track them down.
Lulz Security has claimed responsibility for hacking websites of the CIA, US Senate, Sony and others.