Tiburon was an inhabited planet orbiting the primary Tiburon, in the Beta Quadrant. This was the homeworld for the Tiburonians, a warp-capable 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")
According to FASA's The Federation sourcebook, Tiburon was the second planet in the Beta Theseus system.