Tiburon was an inhabited planet orbiting the primary Tiburon in the Beta Quadrant. This was the homeworld for the Tiburonians, a warp-capable humanoid species.
Zora was an infamous historical figure on Tiburon, known for her cruel and inhumane experiments on humanoid subjects to test the body chemistry of subject tribes. (TOS: "The Savage Curtain")
In 2149, Doctor Phlox attended an IME conference on Tiburon, where he briefly met a member of the Mazarite delegation. Unknown to him at the time, this member was actually a Klingon expert in metagenics research, named Dr. Antaak. The Klingons were not invited to the conference. (ENT: "Affliction")
Tiburon was the former home of Dr. Sevrin in the mid-23rd century, where he studied to become an expert in the fields of acoustics, electronics, and communications. (TOS: "The Way to Eden")
This planet was only mentioned in dialogue.
This planet's quadrant of origin is inferred based on the position of its star as seen in the star chart appearing in the Star Trek: Discovery episode "An Obol for Charon".
According to FASA's The Federation sourcebook, Tiburon was the second planet in the Beta Theseus system.