- M
- M&M's
- M&S (Death in Heaven)
- M'Gomery (Secret Agent Man)
- M'Kabel
- M'dak
- M'rek'd
- M-1
- M-ray
- M.C. Cyber and the Cyberaps
- M.I.A.
- M.O.T.
- M. B. Okonjo
- M. C. Escher
- M. De Courtenay
- M. G. Clark Printing Co.
- M. Henshaw (The Pyramid at the End of the World)
- M. J. Sandlers
- M. R. James
- M. R. Samms
- M. Scott
- M. Sillington
- M. Steer
- M. Van Kerk
- M. Wade
- M1
- M20
- M25 motorway
- M3 Variant
- M4
- M5
- M570 NAW
- M5 (motorway)
- M6
- M62
- M692 BLK
- M82
- M83
- M84
- M87
- M9
- MADAM
- MARVE
- MASER
- MAS 1
- MB
- MDZ Research
- MD 20879
- ME16
- MEV
- MFI
- MG Harris
- MH Norris
- MI5
- MI5/Appearances
- MI6
- MI6/Appearances
- MI6 Building
- MIAOW
- MIAOW/Appearances
- MIAOW copter
- MICA
- MISSY 1
- MISSY 2
- MISSY 3
- MISSY 4
- MIT
- MITRE headset
- MJ Matthews
- MK3 Emergency transceiver
- MMAC
- MM DVD 25
- MM DVD 26
- MM DVD 27
- MM DVD 42
- MM DVD 52
- MM DVD 64
- MM Rocket Co. Inc.
- MM VHS 1
- MM VHS 10
- MM VHS 11
- MM VHS 12
- MM VHS 13
- MM VHS 14
- MM VHS 15
- MM VHS 16
- MM VHS 17
- MM VHS 18
- MM VHS 19
- MM VHS 2
- MM VHS 20
- MM VHS 21
- MM VHS 22
- MM VHS 23
- MM VHS 24
- MM VHS 25
- MM VHS 26
- MM VHS 27
- MM VHS 28
- MM VHS 29
- MM VHS 3
- MM VHS 30
- MM VHS 31
- MM VHS 32
- MM VHS 33
- MM VHS 34
- MM VHS 35
- MM VHS 36
- MM VHS 37
- MM VHS 38
- MM VHS 39
- MM VHS 4
- MM VHS 40
- MM VHS 41
- MM VHS 42
- MM VHS 43
- MM VHS 44
- MM VHS 45
- MM VHS 46
- MM VHS 47
- MM VHS 48
- MM VHS 49
- MM VHS 5
- MM VHS 50
- MM VHS 51
- MM VHS 52
- MM VHS 53
- MM VHS 54
- MM VHS 55
- MM VHS 56
- MM VHS 57
- MM VHS 6
- MM VHS 7
- MM VHS 8
- MM VHS 9
- MOBILEX
- MOTLO pendant
- MP3
- MP3 player
- MP 38
- MP 57
- MP 58
- MP 59
- MP 60
- MRI
- MRSA
- MRS GREN
- MR James
- MTA
- MTA employee (Revolutions of Terror)
- MTB Heroic
- MTFX
- MW0 737X
- MXQ1
- MZ laser
- M A C Adams
- M J Barzey
- M Porter
- Ma' at
- Ma (Gridlock)
- Ma Baker
- Ma Baker (song)
- Ma Barker
- Ma Bear
- Ma Doras
- Ma Taproot
- Ma and Par (comic story)
- Maa'lon
- Maaga
- Maakrian swamp-bear
- Maanuv Thiara
- Maarcheen
- Mab
- Mabe
- Mabel's Diner
- Mabel (Dot and Bubble)
- Mabel (Lost Property)
- Mabel (Pass It On)
- Mabel (The Beast Below)
- Mabel (The Slots of Giza)
- Mabel Ann Lewis
- Mabel Clarence
- Mabel Clutterthorpe
- Mabel Dobbs
- Mabel Pines
- Mabli
- Mac'atyde
- MacDonald, O'Brien and Withers
- MacDonald (All-Consuming Fire)
- MacTaggart
- Mac (Doctor Who?)
- Mac (The Devil Goblins from Neptune)
- Mac (The Many Hands)
- Mac (disambiguation)
- Mac McDonald
- Mac Rogers
- Macarena
- Macaroni and cheese
- Macaroon
- Macaroon dispenser
- Macbeth
- Macbeth (character)
- Macbeth of Scotland
- Maccateer Street
- Macclesfield
- Macduff
- Macduff's children
- Mace (T. memeticus: A Morphology)
- Mace (weapon)
- Macedon
- Macedonia
- Mach-Teldak
- Macha
- Machado
- Machasma
- Machete
- Machete Tourettes
- Machi
- Machina
- Machine
- Machine-heart
- Machine (Guardian At The Gate)
- Machine (Newtons Sleep)
- Machine Hall
- Machine Head
- Machine Man
- Machine That Goes "Ding"
- Machine Time (short story)
- Machine brain
- Machine learning
- Machines (audio anthology)
- Machines (audio story)
- Machines Like Us (audio story)
- Machonite
- Machtien
- Machu Picchu
- Macintosh
- Macintyre
- Mack (Fellowship of Ink)
- Mack Gideon
- Mack Yeovil
- Mackal
- Mackay's Music
- Mackendrick
- Mackenzie (Cat and Mouse)
- Mackenzie Brooks
- Mackie
- Mackintosh
- Macklemore
- Macleb
- Macon
- Maconsa
- Macpherson Street
- Macra
- Macra/Appearances
- Macra Empire
- Macrae
- Macrinus
- Macro-virus
- Macrobe
- Macrotransmission of a K-filter wavelength
- Macy
- Macy's
- Mad-dodontorus disease
- Mad Byron
- Mad Colin
- Mad Dogs and Englishmen (novel)
- Mad Hatter
- Mad Jack
- Mad Martha (comic story)
- Mad Merlin
- Mad Mind of Bophemeral
- Mad Norwegian Press
- Mad Norwegian Press (in-universe)
- Mad Passenger