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- Into the Darkness, Go I
- Into the Looking Glass
- Intraspinal Inhibitor
- Intrepid Class
- Invernian Herb
- Inversion Nebula
- Invidium
- Io
- Ion
- Ionic Pulse
- Ios Malinae
- Iotian
- Ipecac
- Iradon
- Iradonian
- Irc
- Ire Williams
- Iresine Syndrome
- Iridium
- Irilx
- Irlix
- Irlixian
- Iron Man Mark I
- Irregular Federation Forces
- Irrol
- Isaac Shilling
- Isibeal Nic Liam
- Iso-Modulator
- Isoboromine
- Isolinear Chip
- Isolinear Spanner
- Isolitic Converter
- Isotropic Restraint
- Isra Caliel
- Iverson's disease
- Ivor Prime
- Izaldi
- J'naii
- J'naii (planet)
- Jack O'Lar
- Jackie Smith
- Jaclyn Fairly
- Jacob Jackson
- Jacqueline Teresa Bristed
- Jaelle (Jessica) Foxglove
- Jakarna II
- Jake Haltom
- Jakmanite
- James Alexander
- James Bell
- James Guildford
- James Guildford (Utopia Planitia)
- James Guilford (Utopia Planitia)
- James Hudson
- James T. Kirk
- Jana Bell
- Janel Tarna
- Janel Tarna/Medical and Psychological Records
- Janeway's Shuttle (SC-4)
- Janeway Science Award
- Janey Brown
- January Evasdottir
- Janus VI
- Janus VI.
- Jaromil Courtemanche
- Jaros II
- Jasmin Mohandas
- Jasmine
- Jason Bell
- Jason Briggs III
- Jason Dema
- Jason Miller
- Jaton Alyl
- Jaton Belden
- Jay
- Jefferies Tubes
- Jeffries tubes
- Jem'Hadar
- Jennifer Bates
- Jennifer Caskie
- Jennifer Rulestaad
- Jennifer Smith
- Jericho (Jack) Haynes
- Jericho Nolan
- Jerrico Nolan
- Jessica Signos
- Jevonite
- Jewort Trewe
- Jezebel Trelawney
- Jim McCrary
- Jimrpg59
- Jo Smith
- Joba
- Joel Kilowa
- John Alexander
- John Armstrong
- John Banowsky
- John Frederick of Saxony
- John Freeman
- John Linskens
- Joined Trill
- Jon Nayati
- Jonas Lemar
- Jonathan Jackson
- Jonathan Linskens
- Jono Bradley
- Jono Janeway
- Jopek
- Joran Matthew Brownlee
- Jordan Montgomoery
- Jorsad Ari
- Jose Rameriz
- Joseph Darren Jackson
- Joseph Taylor
- Joseph Willowbrook
- Josh Caskie
- Josh Smith
- Jouret IV
- Joz
- Jozem
- Juhraya
- Julia Tagliani
- Julman
- Jupiter
- Jupiter Station
- Just Another Saturday Night
- Jynea Kreung
- K'Palla
- K'Ratoc
- K'Thartek
- K'ran
- K-T Extinction
- K3 Indicator
- Kabor Prime
- Kabrel I
- Kadyl
- Kaelon
- Kaelon II
- Kai
- Kaitlyn Mackenzie
- Kalandan
- Kalandan Outpost
- Kaldra IV
- Kalla-Nohra Syndrome
- Kalla III
- Kasian Poldan
- Kataan
- Kataan Probe
- Katherine 'Kitty' Fisher
- Katherine Knight
- Katra
- Kavis Alpha IV
- Kavol
- Kaylee Michelle Jackson
- Kaylee Parker
- Kayolane
- Kaz Belden
- Kazon
- Kea IV
- Kedion Pulse
- Keira Mere
- Keira Merek
- Kel'Sima
- Kelbonite
- Keldon Class
- Kelindide
- Kellinite
- Kelma
- Kelmar
- Kelotane
- Keltoi Class
- Kelvas V
- Kemocite
- Kenda II
- Kenneth McKenzie
- Kenneth Smith
- Kenneth William Rooker
- Kessik IV
- Kestra Troi
- Keto-Enol
- Ketracel-White
- Kevin Jordan
- Khitomer
- Khitomer Accords
- Khitomer Conference
- Khoda City
- Khran
- Kibberian Fire Diamond
- Kieto Sayoma
- Kimda III
- Kimdan
- Kimiko Ichijo
- Kindoo Pachakan
- Kinoplasmic Radiation
- Kintara IV
- Kintara Syndicate
- Kirkwall
- Kironide
- Kirsten Summers
- Klaestron IV
- Klagth
- Klavdia III
- Klendth
- Klingon
- Klingon-Cardassian Alliance
- Klingon Empire
- Knassis
- Kobali
- Kobayashi Maru
- Kodess Technical Specs
- Kohlinar
- Koladan Diamond
- Kolarus III
- Kolinahr
- Kondalka Village
- Kora
- Kora II
- Korak
- Koranium
- Korma
- Korvat
- Kozan
- Kozan-Kozana
- Kozana
- Kozani
- Kqrik
- Kraal
- Kraus IV
- Krieger Wave Converter
- Krieger Waves
- Krige
- Kritassa
- Krobal
- Kurt Palmer
- Kyle Locke
- K’Ratoc
- K–T Boundary
- L-S VI
- LCARS
- LSD
- Laatstekans
- Lactra VII
- Lacunar amnesia
- Ladarium
- Lalo Rodriguez
- Lanista
- Lantar Nebula
- Largo V
- Larosian virus
- Laser Drill
- Laser Micrometer
- Laser Scalpel
- Laser Welder
- Lassus
- Lateral Impulse Control System
- Latinum
- Latinum Throne
- Lay Over
- Leadville
- Lebranski Database
- Lectrazine
- Ledaria Prime
- Leena Vell
- Leesa N. Stanton
- Lemma II
- Leo Foyle
- Leonal Drizzt
- Leonard Mccoy's Comparative Alien Physiology
- Leporazine
- Lepracarian
- Lepton
- LeqSI'
- Lertani IV
- Lertani System
- Leslie Decker
- Lest We Forget
- Letters of Marques
- Lewis Blake
- Lewis Nymes
- Lewis O'Hara
- Lexorin
- Lhiannon Kindell
- Li Fung
- Liam O'Neill
- Lieutenant Cosico Thoma's
- Life Support
- Life Support Belt
- Light Year
- Lightship Endeavour
- Lightstick
- Linear Models Of Viral Propagation
- Liquidator
- Lise Arianna
- Liz Geuken
- Lo'ren's Story
- Lo'ren T'Vof
- Lobi Crystal
- Locutus
- Long-Term Medical Holographic Program
- Lord Gled Forsch
- LoriChickadee
- Lorimar Class Runabout
- Lotos City
- Louis Remey
- Lovall
- Lt. (jg)
- Lucia Del Santos
- Lucovexitrin
- Lucrovexitrin
- Luna
- Luna Class
- Lupo Dal
- Lydia Stakes
- M'Elissa
- M'Epak
- M'Rurrh
- MARS
- MEMORIAM
- MRD Lily Sloane
- MSD Lily Sloane
- MaQmIgh
- Macrospentol
- Madeline Kingston
- Madison Davis
- Maglock
- Magna-Spanner
- Magnasite-Nitron Tablet
- Magnesite
- Magnetar
- Magnetic Constrictor
- Magnetic Interlock
- Magneton Pulse
- Magneton Scanner
- Magnetosphere
- Mahko Root
- Main Page
- Main Stage Flux Chamber
- Main Stage Flux Chiller
- Maita Belden
- Makara Herb
- Mako Fighter
- Mako Fighter AI
- Makus III
- Malleus Maleficarum
- Manhattan Ball Drop