Gamma Trianguli IV was the inhabited fourth planet of the Gamma Trianguli system. The system was located in the Gamma Trianguli sector. This was a non-Federation planet. Lieutenant Commander Wendy Neuss, a crewmember aboard the USS Enterprise-D, was from this planet.

In 2369, this planet was listed on the chart USS Enterprise Personnel Database, which was displayed on a PADD used by Captain Jean-Luc Picard on aboard the Enterprise-D. (TNG: "The Chase", okudagram)

This planet was only mentioned in writing.
According to Star Trek: Star Charts (p. 37) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Gamma Trianguli system was located in the Alpha Quadrant.