Labels which are indented have no illustrations.
Label scans which have been sent in to this site have often been been given black vinyl 'surrounds' to make them match the others; therefore singles which are shown with a serrated ridge around the label may not actually have had that ridge.

MA
MACCABEES
MACDONALD 345
MACDONALD JUNIOR REFERENCE LIBRARY
MACYM
MAD DAN
MADE IN HEAVEN
MADE TO MEASURE
MADRIGAL (Lissen)
MADRIGAL / LES ROBERTS
MAGIC (MG prefix)
MAGIC (no prefix)
MAGNET (MAG prefix)
MAGNET (MA prefix)
MAGNUM (MAG-000 numbers)
MAGNUM (GUN prefix)
MAGNUM (MAG-100 numbers)
MAGPIE (MMA prefix)
MAGPIE (IS/BB prefix)
MAIDEN MUSIC
MAIN LINE
MAINSPRING
MAINSTREAM
MAJENTA
MAJOR MINOR
MAJOR OAK
MALPAD
MALT MILL
MAM
MAMBA
MANDAL
MANDALA
M & L
M AND M (FFM prefix)
M AND M (MM prefix)
M AND S
MANGO
MANGO MEDIA
MANHATTAN
MANIC
MANTICORE
MANX RADIO (219)
MAP
MAPLE ANNIE
MAQUIS
MAR
MARABO
MARGINAL
MARGO
MARIONICS
MARIX
MARK WINSTON
MARLIN
MARY GLASGOW & BAKER
MARY LYN
MASCOT
MAT
MATCH (Football)
MATCH (Soul / Dance)
MATCHBOX CLASSICS
MATUMBI MUSIC CORP
MAURICE SPALDING PUBLICITY LTD.
MAXI TROJAN
MAYC
MAYFAIR
MAYHEM
MAYKER
MAYPOLE
MC
MCA
MCA-U.K.
MCCB
MEDRECO
MEGAPHONE
M.E.I.
MELODY
MELODY AND RHYTHM
MELODY SCOTLAND
MENCAP
MENTAL HEALTH COUNCIL MER
MERCURY
MERIMUSIC
MERLINMERRY MAKERS
MERSEY
MERSEY SOUND
METEOR
METRO METROPAK
METTLE
MFP
MGM
MHA
MHG
MIAMI
MICH
MICKEY FINN
MICROGROOVE
MICRON MUSIC
MIDAS RECORD
MIDDLE EARTH
MIDLAND INTERNATIONAL
MIDLAND MANAGEMENT
MIDLAND SOUND RECORDINGS
MIDNIGHT HOUR
MIDSONG INTERNATIONAL
MIK
MILESTONE
MILITANT MILLER
MIMCOS
MINT
MIRACLE
MIRAMAR
MIRTO
MITCHELL ARMSTRONG
MIXCREST
MJB
MMA
MOBY PRODUCTIONS / SHETLAND MUSIC CO. MODE
MODELLO
MOJEM
MOJO
MONARCH
MONA'S ISLE
MONITOR
MONOLITH
MONSTERS
MONTAGU
MONTROSE
MONUMENT
MONZA
MOO
MOODISC
MOONBEAM
MOONCREST
MOONEY'S
MORE CUT
MORPHEUS
MORRISTON ORPHEUS CHOIR
MORTONSOUND
MOR-WELL ESQ.
MOSKOW
MOTHER
MOTIVE MUSIC
MOTOR
MOTOR CITY RHYTHM
MOTORWAY SOUNDS
MOTOWN / TAMLA MOTOWN
MOUNTAIN
MOUTH
MOVERS
MOWEST
MP
MPA
M R. (MATUMBI)
MR. BIG
MR. PICKWICK
MSE
MSR / MIDLAND SOUND RECORDINGS
MSR (Reggae)
MULTICORD
MUMS
MUN?
MUNDANE MUSIC
MUSCLE
MUSHROOM
MUSIC BANK
MUSIC FOR PLEASURE / SURPRISE SURPRISE
MUSIC INCORPORATION
MUSIC MACHINE
MUSIC MASTERS
MUTE
M.W.B.
MWM
MWS
MY
MY RECORD
MYRRH
MYSTIC BIRD
MY WAY