1. MGN - Noun
2. MGN - Proper noun
(UK, journalism, historical) Initialism of Mirror Group Newspapers.
(UK, railways, historical) Initialism of Midland and Great Northern.
Initialism of marine guidance note.
(anatomy) Initialism of medial geniculate nucleus.
(medicine) Initialism of membranous glomerulonephritis.
Source: en.wiktionary.org