See Sydney for other articles with titles that contain, either by relationship or by coincidence, this character's surname.

Lieutenant Sydney was a female Human Starfleet officer who served aboard the USS Enterprise in 2269. Sydney was an ethnologist scholar and overall expert on Klingon society, and was described as being a "beautiful young woman with a dark complexion". (TOS novel: Trek to Madworld)

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USS Enterprise (NCC-1701) sciences personnel
under Charles Rasmussen & Robert April	Allinsky • Griggs • N'a'tt'n'a'i • Osterman • Ramirez	under Christopher Pike	Cayman • Chia • Davies • Kirk • Lucero • Reed • Shinobi • Spock • T'Pris • Viola • Yu
under James T. Kirk (first five-year mission)	Ackroyd • Alden • Amstel • Aristeides • Avitts • Bennit • Berganza • Bergdahl • Berkley • Berry • Berryman • Bistie • Boma • Bordell • Brad • Brent • Calloway • Carstairs • Charvat • Clark • D'Amato • Darnell • Dimas • Domberwicky • Durban • Ellis • Erickson • Errgang • Faust • Ferriter • Fisher • Follett • Frank • Freeman • Freyer • Galway • George • Giacomo • Gilden • Greelee • Greenburg • Haines • Harrison • Helman • Hernandez • Herrada • Hinton • Homeyer • Hopkins • Hurst • Irizarry • Jaeger • Jameson • Jaramillo • Karras • Kearly • Krisp • Kwan • Lawton • Lindstrom • Lowrey • Mai • Manprasad • Margolis • Mason • C. Masters • Maynooth • McGivers • Meier • Mejia • Mendoza • Moreau • Morris • Mulhall • Nelson • O'Hara • O'Shea • Owens • Palamas • Parham • Pearson • Perez • Phillips • Pittarese • Plikin • Randall • Rathbone • Niall Rawlins • Rodino • Rodriguez • Romaine • Rose • Russell • Sanchez • Schafer • Spock • Stewart • Sturgeon • Sulu • Sydney • Tamboline • Tormolen • Tracy • Tremain • Valjean • Vedama • Vigeland • D. Watley • E. Watley • Weaver • Weinberg • Wells • Ybarra
subsequent missions under Kirk & Spock	Amaar • Bolek • Chang • D'Hennish • Fisher • Freeman • Greywolf • Haley • Hester-Jones • Kwan • W. Meier • Nakashima • Naraht • Saavik • Sagady • Sonak • Spock • Tenaida • Themon • Theras • T'Yee • Uuvu'it • Whitehorse
see also: administrative personnel • communications personnel • engineering personnel • medical personnel • pilots & flight control personnel • security & tactical personnel • senior staff • unnamed (2240s and 2250s • 2260s • 2270s and 2280s)