- Lyra constellation
- Lyra system
- Lyran
- Lyran (disambiguation)
- Lyran Star Empire
- Lyran advanced command cruiser
- Lyran captain
- Lyran command cruiser
- Lyras
- Lyre
- Lyridian
- Lyrinda Halk
- Lyrrin
- Lysander
- Lysander's World
- Lysander Murat
- Lysergic acid diethylamide
- Lyshan
- Lysia
- Lysia Arlin
- Lysira
- Lyssa Campbell
- Lysserian desert larva
- Lytasia
- Lytasia (planet)
- Lytasia system
- Lytasian
- Lytasian Redevelopment Fund
- Lythora
- Lyton
- Lytus
- M'Benga (disambiguation)
- M'Benga class
- M'Bol
- M'Char
- M'Char boarding party
- M'Chla class
- M'Dras
- M'Gura
- M'Kan
- M'Kec
- M'N'Alli
- M'Narth
- M'Nirl
- M'Nok
- M'Pella
- M'Raq, son of K'Ton
- M'Raq, son of K'Ton (mirror)
- M'Rek
- M'Rel
- M'Rep
- M'Roaa
- M'Rod
- M'Rvyn
- M'Tara
- M'Tara'ren
- M'Tell
- M'Tesint
- M'Umbha Uhura
- M'Yengh Yards
- M'Yeoh
- M'Zeo
- M'assadi
- M'dai sensor dish
- M'dok
- M'dok Empire
- M'grash
- M'hetya
- M'kar
- M'kemas III
- M'klexa
- M'leint
- M'lu
- M'morr
- M'och class
- M'radd
- M'rade System Patrol
- M'rak
- M'ret
- M'riiah
- M'sarr
- M'tachtar
- M'thal
- M'theo Niisil
- M'turr
- M'ven
- M'vil
- M'yra
- M-09648
- M-10 computer
- M-113
- M-155
- M-20391
- M-21
- M-21200
- M-317
- M-317 geological experimental station
- M-370
- M-49213
- M-5 computer
- M-5 computer (mirror)
- M-78526
- M-78526 (Itari system)
- M-78526 (Tyburn system)
- M-7A computer
- M-98515
- M-9 computer
- M.C. DeMarco
- M.C. Minor
- M.S. Murdock
- M. Becker
- M. Chambers
- M. Ellison
- M. Fincke
- M. George
- M. Howard (22nd century)
- M. Jacque-Metton
- M. Michaels
- M. Ngara
- M. Romero (Private)
- M. Sussman
- M. Tarack
- M. Wallace
- M110
- M148-08054
- M148-08450
- M148-10564
- M148-15145
- M148-16054
- M148-16458
- M148-47850
- M148-48084
- M148-48469
- M148-48486
- M148-68405
- M148-69696
- M148-78456
- M148-78466
- M148-80584
- M148-84015
- M148-84055
- M148-84264
- M148-89416
- M148-94535
- M148-96569
- M148-98259
- M148-98741
- M148-99456
- M16 assault rifle
- M1 Garand
- M23 Cluster
- M24 Alpha
- M30C9
- M32
- M43 Alpha
- M43 Alpha IX
- M43 Alpha X
- M67 Alpha
- MA12 class
- MACO (mirror)
- MACO ranks
- MAO
- MD8 class
- MI'qIpe
- MI'qIpe I
- MI'qIpe II
- MI'qIpe III
- MI'qIpe III-A
- MI'qIpe IV
- MIRV photon torpedo
- MP-177
- MP-177-A
- MP-309
- MP-309-A
- MP-442
- MP-442-A
- MP-505
- MP-505-A
- MP-592
- MP-592-A
- MP-80
- MP-80-A
- M Continuum
- M class star
- Ma'Acy
- Ma'Frnats
- Ma'Staka
- Ma'adrys
- Ma'kella
- Ma-Karn class
- Ma-aira Thenn
- MaTara
- Ma Jouvirna
- Ma erh tsai mao tan ch'ing
- Maab
- Maagla Fremaa
- Maalo
- Maapek
- Maar'saan
- Maark
- Maass
- Maass (disambiguation)
- Maat
- Maaz II
- Mab-Bu VI
- Mabarra V
- Mabgonian plague
- Mabinogi
- Mabli vestai Galann
- Mabrae
- Mabus
- MacArthur
- MacArthur (disambiguation)
- MacArthur I
- MacArthur II
- MacArthur III
- MacArthur IV
- MacArthur V
- MacDonald
- MacDougal
- MacDuff (disambiguation)
- MacDuffy
- MacElwain
- MacGregor
- MacKenzie
- MacKenzie class
- MacNess
- MacPherson Nebula
- MacReady
- Mac (disambiguation)
- Mac (month)
- Macadama
- Macador
- Macaiah
- Macaroni
- Macaroni and cheese
- Macbeth
- Maccabees
- Maccabees I
- Maccabees I-A
- Maccabees I-B
- Maccabees II
- Maccabees III
- Mace
- Mace Magellan
- Macedon
- Macedon Chamber of Commerce
- Macedon III
- Macedon system
- Macedonia (disambiguation)
- Macedonia I
- Macedonia system
- Macejoo
- Mach ghotI'
- Machete
- Machine
- Machine gun
- Macias
- Maciello
- Macintosh
- Mack Kane
- Mack McCall
- Mack Reynolds
- Mackensie McBride
- Mackensie McBride (24th century)
- Mackenzie Calhoun
- Mackenzie Calhoun's family
- Mackenzie Paris
- Macon
- Macrita Helleck
- Macro
- Macrobiotic food
- Macrocosm
- Macron
- Macroscopic
- Macrovirus
- Mad Doc Software
- Mad Hatter
- Mad Jack
- Mad Planet
- Mad Zook
- Mada
- Madagascar
- Madalyn Dougherty
- Madame Altair's House of Joy
- Madame Chang's Mandarin Cafe
- Madame Curie
- Madara
- Madden
- Madden (disambiguation)
- Maddux
- Maddux II
- Maddy
- Maddy Calloway
- Made Out of Mudd
- Madeline (Dixon Hill)
- Madeline (Kelvin timeline)
- Madeline Robins
- Madellin Prime
- Madia
- Madia (disambiguation)
- Madia (planet)
- Madison
- Madison (disambiguation)
- Madison Picard
- Madison class
- Madonna
- Mador Base
- Madorax
- Madras
- Madras IV
- Madrasaur
- Madrav
- Madred
- Madred (mirror)
- Madrid
- Madrid (disambiguation)
- Madrid (starship)
- Madrigal
- Madza Bral
- Mae Darwin
- Mae West
- Maeglin
- Maelgwyn
- Maelstrom
- Maelstrom (collection)
- Maelstrom class
- Maessonhi'liis
- Mafia Don
- Mag
- Magama
- Magark
- Magatha IV
- Magazine
- Magda
- Magda Kovacs
- Magda Kovacs (mirror)
- Magdalena Ferson
- Magdalena Reynolds
- Mage
- Magee
- Magee class
- Magefferan
- Magefferus
- Magefferus III