The Argus sector was a sector of space.

In 2370, the USS Enterprise-D was originally assigned to this sector, but Admiral Chekote allowed the Enterprise to postpone its mission there and search for a band of mercenaries which had apparently murdered Captain Picard. (TNG: "Gambit, Part I")

This sector was only mentioned in dialogue.
According to, this sector was named for a star with that name.
The Star Trek Encyclopedia (4th ed., vol. 1, p. 44) located the Argus sector in Federation space.
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