The Norkan outposts were a series of outposts destroyed by Romulan forces, commanded by Admiral Alidar Jarok, in the Norkan Campaign. The Federation decried the attacks as a massacre. (TNG: "The Defector")

According to the Star Trek Encyclopedia (4th ed., vol. 2, p. 87), the outposts were located near the Romulan Neutral Zone.
According to Star Trek: Star Charts (p. 66, "United Federation of Planets I") and Stellar Cartography: The Starfleet Reference Library ("Stellar Cartography", pp. 18-19; "Federation Historical Highlights, 2161-2385”), there was a star system named Norkan (Pi Hydrae), in which these colonies might possibly have been located, in the Beta Quadrant. The system's primary was a K-class star. In 2378, the Norkan outposts were listed as a Federation member.