Dax could refer to:

• Dax (Crewman), an alien Starfleet crewmember aboard the USS Enterprise-A
• Dax (symbiont), the Trill symbiont hosted by several Trill, including Jadzia and Ezri
• Dax, son of Kang, named for Curzon Dax, and born in the late 23rd century
• "Dax", the first-season DS9 episode
• The Lives of Dax, an anthology which features the Dax hosts

• You may also be looking for one of the hosts of the Dax symbiont:

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